{"abstract":"Every conversion moves values the wrong way by the offset difference.","category":"Tide and marine navigation tables","checks":7,"contract":"Input [kind, value, frm, to, table]: table lists [datum, offset above chart datum]; CD itself has offset 0 even if absent. Heights and drying heights are measured upward from their datum; depths downward. Converting frm->to: height=value+off[frm]-off[to], depth=value-off[frm]+off[to]. Unknown datum names return None. Result rounded to 3 decimals.","evaluation_group":"w2-tide_and_marine_navigation_tables-datum_shift","failed_approach":"Taking the absolute difference is right in only one direction.","family":"w2-tide_and_marine_navigation_tables-datum_shift-shift-direction","id":"FA-69096","implementations":{"attempt":{"sha256":"4ef0cc8bb446c69598535fabc5cc04aa9bab48d9b492fee4d35a1b7f4c4c86dc","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(x):\n    kind,val,frm,to,table=x\n    off=dict(table)\n    off.setdefault('CD',0.0)\n    if frm not in off or to not in off: return None\n    shift=abs(off[frm]-off[to])\n    if kind=='depth': res=val-shift\n    else: res=val+shift\n    return round(res,3)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('vertical datum conversion [\"height\", 3.1, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 3.1, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 0.7), ('vertical datum conversion [\"depth\", 12.0, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 12.0, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 14.4), ('vertical datum conversion [\"depth\", 7.5, \"MSL\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 7.5, 'MSL', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.1), ('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"drying\", 1.4, \"CD\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 1.4, 'CD', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 1.7), ('vertical datum conversion [\"drying\", 0.8, \"MLWS\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 0.8, 'MLWS', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -1.1), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8)], [('vertical datum conversion [\"depth\", 12.0, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 12.0, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 14.4), ('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"drying\", 1.4, \"CD\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 1.4, 'CD', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 1.7), ('vertical datum conversion [\"drying\", 0.8, \"MLWS\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 0.8, 'MLWS', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -1.1), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"height\", 2.0, \"CD\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'CD', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 2.0), ('vertical datum conversion [\"height\", 2.0, \"ODN\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'ODN', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None)], [('vertical datum conversion [\"depth\", 7.5, \"MSL\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 7.5, 'MSL', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.1), ('vertical datum conversion [\"drying\", 0.8, \"MLWS\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 0.8, 'MLWS', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -1.1), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"height\", 2.0, \"CD\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'CD', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 2.0), ('vertical datum conversion [\"height\", 2.0, \"ODN\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'ODN', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None), ('vertical datum conversion [\"depth\", 3.0, \"CD\", \"ODN\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 3.0, 'CD', 'ODN', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None), ('vertical datum conversion [\"height\", 0.0, \"LAT\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 0.0, 'LAT', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -0.3)], [('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"depth\", 3.0, \"CD\", \"ODN\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 3.0, 'CD', 'ODN', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None), ('vertical datum conversion [\"height\", 0.0, \"LAT\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 0.0, 'LAT', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -0.3), ('vertical datum conversion [\"depth\", 9.0, \"MHWS\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 9.0, 'MHWS', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 4.1), ('vertical datum conversion [\"height\", 1.0, \"MSL\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4]]]', ['height', 1.0, 'MSL', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4]]], 3.7), ('vertical datum conversion [\"height\", 3.1, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 3.1, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 0.7)], [('vertical datum conversion [\"drying\", 1.4, \"CD\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 1.4, 'CD', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 1.7), ('vertical datum conversion [\"height\", 0.0, \"LAT\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 0.0, 'LAT', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -0.3), ('vertical datum conversion [\"height\", 1.0, \"MSL\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4]]]', ['height', 1.0, 'MSL', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4]]], 3.7), ('vertical datum conversion [\"height\", 3.1, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 3.1, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 0.7), ('vertical datum conversion [\"depth\", 12.0, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 12.0, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 14.4), ('vertical datum conversion [\"depth\", 7.5, \"MSL\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 7.5, 'MSL', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.1), ('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8)]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"49d5e4666a00b1040048e92791b1d2b13f18ad228b089deaa67bd1e35b1d42c1","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(x):\n    kind,val,frm,to,table=x\n    off=dict(table)\n    off.setdefault('CD',0.0)\n    if frm not in off or to not in off: return None\n    shift=off[to]-off[frm]\n    if kind=='depth': res=val-shift\n    else: res=val+shift\n    return round(res,3)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('vertical datum conversion [\"height\", 3.1, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 3.1, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 0.7), ('vertical datum conversion [\"depth\", 12.0, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 12.0, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 14.4), ('vertical datum conversion [\"depth\", 7.5, \"MSL\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 7.5, 'MSL', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.1), ('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"drying\", 1.4, \"CD\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 1.4, 'CD', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 1.7), ('vertical datum conversion [\"drying\", 0.8, \"MLWS\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 0.8, 'MLWS', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -1.1), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8)], [('vertical datum conversion [\"depth\", 12.0, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 12.0, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 14.4), ('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"drying\", 1.4, \"CD\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 1.4, 'CD', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 1.7), ('vertical datum conversion [\"drying\", 0.8, \"MLWS\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 0.8, 'MLWS', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -1.1), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"height\", 2.0, \"CD\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'CD', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 2.0), ('vertical datum conversion [\"height\", 2.0, \"ODN\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'ODN', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None)], [('vertical datum conversion [\"depth\", 7.5, \"MSL\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 7.5, 'MSL', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.1), ('vertical datum conversion [\"drying\", 0.8, \"MLWS\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 0.8, 'MLWS', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -1.1), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"height\", 2.0, \"CD\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'CD', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 2.0), ('vertical datum conversion [\"height\", 2.0, \"ODN\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'ODN', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None), ('vertical datum conversion [\"depth\", 3.0, \"CD\", \"ODN\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 3.0, 'CD', 'ODN', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None), ('vertical datum conversion [\"height\", 0.0, \"LAT\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 0.0, 'LAT', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -0.3)], [('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"depth\", 3.0, \"CD\", \"ODN\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 3.0, 'CD', 'ODN', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None), ('vertical datum conversion [\"height\", 0.0, \"LAT\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 0.0, 'LAT', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -0.3), ('vertical datum conversion [\"depth\", 9.0, \"MHWS\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 9.0, 'MHWS', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 4.1), ('vertical datum conversion [\"height\", 1.0, \"MSL\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4]]]', ['height', 1.0, 'MSL', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4]]], 3.7), ('vertical datum conversion [\"height\", 3.1, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 3.1, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 0.7)], [('vertical datum conversion [\"drying\", 1.4, \"CD\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 1.4, 'CD', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 1.7), ('vertical datum conversion [\"height\", 0.0, \"LAT\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 0.0, 'LAT', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -0.3), ('vertical datum conversion [\"height\", 1.0, \"MSL\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4]]]', ['height', 1.0, 'MSL', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4]]], 3.7), ('vertical datum conversion [\"height\", 3.1, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 3.1, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 0.7), ('vertical datum conversion [\"depth\", 12.0, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 12.0, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 14.4), ('vertical datum conversion [\"depth\", 7.5, \"MSL\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 7.5, 'MSL', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.1), ('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8)]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"4aa97a78252ca45687efd9f1f095a5dba4eb6c719f29eb5a224d50ca938f2882","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(x):\n    kind,val,frm,to,table=x\n    off=dict(table)\n    off.setdefault('CD',0.0)\n    if frm not in off or to not in off: return None\n    shift=off[frm]-off[to]\n    if kind=='depth': res=val-shift\n    else: res=val+shift\n    return round(res,3)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('vertical datum conversion [\"height\", 3.1, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 3.1, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 0.7), ('vertical datum conversion [\"depth\", 12.0, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 12.0, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 14.4), ('vertical datum conversion [\"depth\", 7.5, \"MSL\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 7.5, 'MSL', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.1), ('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"drying\", 1.4, \"CD\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 1.4, 'CD', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 1.7), ('vertical datum conversion [\"drying\", 0.8, \"MLWS\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 0.8, 'MLWS', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -1.1), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8)], [('vertical datum conversion [\"depth\", 12.0, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 12.0, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 14.4), ('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"drying\", 1.4, \"CD\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 1.4, 'CD', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 1.7), ('vertical datum conversion [\"drying\", 0.8, \"MLWS\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 0.8, 'MLWS', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -1.1), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"height\", 2.0, \"CD\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'CD', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 2.0), ('vertical datum conversion [\"height\", 2.0, \"ODN\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'ODN', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None)], [('vertical datum conversion [\"depth\", 7.5, \"MSL\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 7.5, 'MSL', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.1), ('vertical datum conversion [\"drying\", 0.8, \"MLWS\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 0.8, 'MLWS', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -1.1), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"height\", 2.0, \"CD\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'CD', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 2.0), ('vertical datum conversion [\"height\", 2.0, \"ODN\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 2.0, 'ODN', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None), ('vertical datum conversion [\"depth\", 3.0, \"CD\", \"ODN\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 3.0, 'CD', 'ODN', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None), ('vertical datum conversion [\"height\", 0.0, \"LAT\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 0.0, 'LAT', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -0.3)], [('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 5.0, 'LAT', 'MLWS', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8), ('vertical datum conversion [\"depth\", 3.0, \"CD\", \"ODN\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 3.0, 'CD', 'ODN', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], None), ('vertical datum conversion [\"height\", 0.0, \"LAT\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 0.0, 'LAT', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -0.3), ('vertical datum conversion [\"depth\", 9.0, \"MHWS\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 9.0, 'MHWS', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 4.1), ('vertical datum conversion [\"height\", 1.0, \"MSL\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4]]]', ['height', 1.0, 'MSL', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4]]], 3.7), ('vertical datum conversion [\"height\", 3.1, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 3.1, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 0.7)], [('vertical datum conversion [\"drying\", 1.4, \"CD\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['drying', 1.4, 'CD', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 1.7), ('vertical datum conversion [\"height\", 0.0, \"LAT\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 0.0, 'LAT', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], -0.3), ('vertical datum conversion [\"height\", 1.0, \"MSL\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4]]]', ['height', 1.0, 'MSL', 'LAT', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4]]], 3.7), ('vertical datum conversion [\"height\", 3.1, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 3.1, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 0.7), ('vertical datum conversion [\"depth\", 12.0, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 12.0, 'CD', 'MSL', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 14.4), ('vertical datum conversion [\"depth\", 7.5, \"MSL\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['depth', 7.5, 'MSL', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.1), ('vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]', ['height', 1.2, 'MHWS', 'CD', [['LAT', -0.3], ['MLWS', 0.5], ['MSL', 2.4], ['MHWS', 4.6]]], 5.8)]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"A deterministic toy model with stipulated rules and constants; not certified hydrographic software or a substitute for official tide tables. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-tide_and_marine_navigation_tables-datum_shift-shift-direction","generated_at":"2026-09-29T14:48:08.272014+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Tide tables and passage plans turn published predictions into go/no-go decisions about depth, clearance and timing.","repair":"Use off[frm]-off[to].","root_cause":"The shift is computed as off[to]-off[frm].","sha256":"690e7f0828d58f03d32cc7a22418c302e3d959397fc4e13adc4b64a200f91265","title":"Vertical datum conversion: Datum offsets are subtracted in reverse order · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":42.734,"exit_code":1,"observations":[{"actual":5.5,"check":"vertical datum conversion [\"height\", 3.1, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]","expected":0.7,"passed":false},{"actual":9.6,"check":"vertical datum conversion [\"depth\", 12.0, \"CD\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]","expected":14.4,"passed":false},{"actual":5.1,"check":"vertical datum conversion [\"depth\", 7.5, \"MSL\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]","expected":5.1,"passed":true},{"actual":5.8,"check":"vertical datum conversion [\"height\", 1.2, \"MHWS\", \"CD\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]","expected":5.8,"passed":true},{"actual":1.7,"check":"vertical datum conversion [\"drying\", 1.4, \"CD\", \"LAT\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]","expected":1.7,"passed":true},{"actual":2.7,"check":"vertical datum conversion [\"drying\", 0.8, \"MLWS\", \"MSL\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]","expected":-1.1,"passed":false},{"actual":4.2,"check":"vertical datum conversion [\"depth\", 5.0, \"LAT\", \"MLWS\", [[\"LAT\", -0.3], [\"MLWS\", 0.5], [\"MSL\", 2.4], [\"MHWS\", 4.6]]]","expected":5.8,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"vertical datum conversion [\\\"height\\\", 3.1, \\\"CD\\\", \\\"MSL\\\", [[\\\"LAT\\\", -0.3], [\\\"MLWS\\\", 0.5], [\\\"MSL\\\", 2.4], [\\\"MHWS\\\", 4.6]]]\", \"actual\": 5.5, \"expected\": 0.7, \"passed\": false}, {\"check\": \"vertical datum conversion [\\\"depth\\\", 12.0, \\\"CD\\\", \\\"MSL\\\", [[\\\"LAT\\\", -0.3], [\\\"MLWS\\\", 0.5], [\\\"MSL\\\", 2.4], [\\\"MHWS\\\", 4.6]]]\", \"actual\": 9.6, \"expected\": 14.4, \"passed\": false}, {\"check\": \"vertical datum conversion [\\\"depth\\\", 7.5, 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