He asks if some of the data is already there. Like demarcation zones
The software could recognize? For instance a zone around that shoal
Area. Could that trip a warning at any zoom if you broke a certain
Distance? Sounds doable and I would leave it on if it was a smart
Device. No warning if I'm out of danger.
For the boats that saw it and sailed around, one warning(sound too for
Sleepers), one tap it goes away.