alro65 aa1b93c7a8 feat: simplify range-daymark to concentric triangles; preserve land cache
map.js — _encRangeDaymarkCanvas:
  Remove tripod legs, hub ring and mast. Symbol is now two clean
  concentric triangles pointing up: outer WHITE + inner BLACK,
  matching the standard IALA dayboard. Optional light flare at apex
  if the feature has LITCHR. No extra structures.

chart_manager.py — _build_cache:
  Don't overwrite existing land/hazard/zone GeoJSON files with an
  empty result when the .000 has no LNDARE/OBSTRN/ZONBND layer.
  Preserves hand-built or legacy cache data for custom charts
  (e.g. Barranquilla built from nav-aids-only CSV).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-30 16:19:01 -04:00
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Maritime Aids-to-Navigation monitoring with AIS and S-57 ENC charts
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