Bump. I also tried using OpenSeaMap and the Fenix didn't like it. Has anyone figured out a way to do this. Would be great for kayaking. Enabling marine features on the watch itself did nothing.
Did you try disabling some of the other "non-marine" maps? I think I had a similar issue when I downloaded some non-Garmin maps. I had to disable the default Garmin maps for them to show up. Not sure if that is your issue but give it a try.
Thank you for the response. I did and also tried several other maps one at a time. None of the Garmin or open maps showed marine features.
This shows the US Nautical Map from VeraciousMaps.com
You need to download the open sea maps in the “latin1” format, not the “utf-8” format. It worked for me with that setting. I did run into a different issue in that my fenix 5x will only load 1 open sea map, even if I put in 2 different maps on the device covering 2 different areas. It picks the biggest map of the 2, in that case and will not show the smaller map as an option to “turn on”. I solved it by just down loading 1 large map from open sea map.
FYI, the Veracious Maps are almost worthless. They show some depth contour, but not any actual land, so you can be in a small lake and it still looks like the ocean- everything is white (and the depth contours don't even seem to show shorelines clearly). I tried a bunch of different ways to get it to overlay with other maps to delineate water/land with no success, and Veracious Maps did not respond to repeated requests for feedback, so I assume they just won't work as hoped.