Passage ETA

What it does

• An ETA built on hull speed alone drifts by the length of the current leg.
• The page splits the leg into current sectors and adds the stop time once.
• Output is a finish window rather than a single optimistic time.

How to use it

1. Split at every headland where the current changes, not at equal distances.
2. Add the stop time once, then re-add it if the stop has a fixed opening time.
3. The slowest sector is the one that decides whether the plan holds.
4. Publish the finish as a window; a single time invites a push.

Safety notes

• A finish window is a planning aid, not a commitment to arrive.
• If the latest finish passes dusk, re-plan the leg rather than shorten the buffer.