Route planner produces straight-line routes that cross land

[navado]

Summary

The route planning tool interpolates straight-line paths between waypoints without land/obstacle avoidance, generating routes that pass through the Albanian/Greek mainland.

Evidence

"The original straight-line interpolation crossed Albanian/Greek mainland - the corrected coordinates should route you properly down the Adriatic coast."

Reported for a Tivat→Korfu route (user explicitly asked "why the route is on land?"). A Pula→Bari route also carried the warning:

"Route is unverified for depth/land crossing - check chart before departure."

Suggested course of action

1. Integrate a land-avoidance or coastline-aware routing algorithm (e.g., a graph over known navigable waypoints, or an existing maritime routing API) in place of or as a post-processing step after straight-line interpolation.
2. At minimum, add a mandatory validation step that checks all waypoints and intermediate interpolated points against a land polygon dataset and rejects/re-routes if any point is on land.
3. Suppress the "unverified for depth/land crossing" disclaimer once proper validation is in place — its presence indicates the current check is absent or advisory-only.
4. Add test cases for Tivat→Korfu and Pula→Bari routes asserting all waypoints have positive water depth and do not intersect known land polygons.

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Generated by Claude Code

[claude]

Triaged: valid, but larger than the auto-fix threshold.
Exceeds automatic implementation because it requires integrating a land-avoidance/coastline-aware routing algorithm (or an external maritime routing API/land-polygon dataset) in place of the current straight-line interpolation — this is an algorithmic/data addition, not a localized bug fix.
Proposed plan:

1. Introduce a coastline/land polygon dataset (or a maritime routing API) and a validation pass over all waypoints + interpolated points that rejects/re-routes any point over land.
2. Replace or post-process the straight-line interpolation with a land-aware path (e.g. a graph over known navigable waypoints/coastal corridors).
3. Once validation is real, drop the standing "unverified for depth/land crossing" disclaimer.
4. Add regression tests for the reported Tivat->Korfu and Pula->Bari routes asserting no waypoint intersects land and depth is positive.

Risks / open questions: needs a licensed/available land-polygon or routing data source; may require a new dependency and meaningfully changes route-planning behavior — worth a design review before implementation.
Remove auto:planned (or add auto:needs-triage) to re-queue once scoped down.

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Generated by Claude Code