FA-69315 / Tide and marine navigation tables / Member archive

Deviation card interpolation: Interpolation assumes a 45 degree card spacing · case 05

Irregular cards give deviations outside the neighbouring values.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Input [heading, card]: card lists [compass heading, deviation] pairs (east positive) in any order. Headings wrap modulo 360; deviation is linearly interpolated between neighbouring card headings, including across the 360/0 seam. Return deviation rounded to 2 decimals.

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
deviation card interpolation [350, [[15, 1.0], [75, 2.5], [120, 0.0], [200, -2.5], [285, -0.5]]]	`1.67`	`0.58`	Failed

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