Navionics and Truman

[ChuckS]

I have a Lowrance HDS 12 Gen 3 and Carbon 9 with a Navionics HotMaps Platinum South Chip. It's new this year and updated about once a month.

Does anyone know the last time they actually mapped Truman Reservoir? I've fished Truman twice this year, and both times, the contours I'm seeing on the downscan are nowhere near what they show on the map, depths seem way off, and the map is missing a bunch of underwater terrain features. Mostly isolated flats.

I get that changes in the water level will affect depths. Trying to figure out if I'm doing something wrong, or the map is just old. Or maybe there's a more recent chip out there for Missouri lakes?

Figured I'd ask here first.
Thanks

[ALF1]

Navionics suck at truman and have for years. The Lakemaster chips for Birds are spot on though.