FA-68933 / Tide and marine navigation tables / Member archive

Secondary port differences: Time difference is rounded before being applied · case 03

Corrected times are a minute off when the interpolated difference has a half minute.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Input dict: standard port HW time hw (minutes of day), height hh, today range rng, mean spring/neap ranges sr/nr, time differences ts/tn (spring/neap, minutes) and height differences hs/hn. Interpolation factor k=(rng-nr)/(sr-nr) clamped to [0,1]; difference = neap+(spring-neap)*k. Time is wrapped to [0,1440) and rounded to whole minutes half up; height rounded to 2 decimals. Return [minutes, height].

Why this case matters

Tide tables and passage plans turn published predictions into go/no-go decisions about depth, clearance and timing.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
secondary port differences {"hw": 610, "hh": 3.5, "rng": 3.0, "sr": 4.0, "nr": 2.0, "ts": -12, "tn": 25, "hs": -0.4, "hn": 0.1}	`[616, 3.35]`	`[617, 3.35]`	Failed

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