I got an echoMAP Plus 93sv last fall with the 2019 maps, and have updated it to the 2020.0 maps, and have found many lakes to be inaccurately mapped. Some lakes it shows me paddling on land. Some lakes it shows humps where there are none (or the hump is 50 feet to the side). Sometimes it shows dropoffs where I'm supposed to be in 30 feet of water and I'm in 10. Some lakes seem spot on, and others seem wildly inaccurate. I'm 95% sure the issue is not with the GPS in the unit, as it shows me close to some land-based features like docks, ramps, and river/creek channels that enter/exit the lake, but the actual lake topography is inaccurate in many spots.
Has anyone else observed this to be true? Minnesota has a lot of lakes so I'm not expecting every single one to be perfect, but I've been pretty disappointed by map accuracy and basically consider them guidelines. I can't trust them for putting me "on the spot" which is really sad. The Navionics acquisition was supposed to give them even better maps but they seem really hit or miss. I love almost everything about my 93sv except the map accuracy. It's making me consider trying a Humminbird just to see if the maps I can get are actually accurate, which I don't want to do because I think their units are incredibly overpriced and I enjoy my 93sv. I just want to be able to go to a point, hump, or ledge that's on the map, and actually be on it when I get there.
Any thoughts from anyone else? I'm having a remarkably hard time finding anyone else talking about this.