I noticed some map settings for Marine, sure looks like it is configured to show depths on bodies of water. I have them enabled, but when I browse to popular lakes around me there are no contour / topographic info . Sure would be nice while fishing when I can't see the depth finder or fishing from a kayak / shore.
I see zero mention of them in reviews either. I thought these would maybe be nice for triathletes , swimmers, or people kayaking / SUP etc.
Has anyone use them ? Maybe only work in oceans?
Here is the section of the user guide.