Pro tip: my phone kept telling me I was in a lake, and it took 2 hours to figure out why
I was trying to map out a walking route near the river in Sacramento and every app kept dropping my pin right in the middle of the water. I messed with location settings, restarted my phone twice, and even re-downloaded the maps app before I checked the actual map data. Turns out someone had tagged a whole stretch of the levee as water on OpenStreetMap, so the map was just wrong, not my phone. Took me about 2 hours to stop blaming my GPS and look at the source. Anyone know the best way to flag bad map data like that so it actually gets fixed?
Congrats on spending two hours fighting your phone when the real problem was some random person on the internet deciding a levee was a lake. Honestly kind of funny that the map just quietly went "nope, you swim now" and you believed it. For getting it fixed, opening a note on OpenStreetMap itself is the usual move, or just drop a comment on the map's forum so a local editor sees it. Either way you'll probably look at the map data first next time.