FA-69338 / Tide and marine navigation tables / Member archive

Anchor rode and swing radius: Swing radius stops at the bow · case 03

The stern swings outside the planned circle.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Input [depth, tmax, tmin, bow, scope, boat_len]: charted depth and tide heights above datum (m). Rode = scope*(depth+tmax+bow) rounded up to the next 5 m chain mark. Swing radius = sqrt(rode^2 - (depth+tmin+bow)^2) + boat_len (largest at the lowest tide), rounded to 0.1 m. Return [rode, radius].

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
anchor rode and swing radius [8.0, 5.1, 0.3, 1.5, 3, 14]	`[45, 43.9]`	`[45, 57.9]`	Failed

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