Garmin maps- incomplete

I've noticed one area of my local lake, which is a major lake, largest man-made in NC, has incomplete topo mapping. One area that I like to fish a good bit has no topo. Mapped all the way to a certain bridge, then nothing. I could use the draw feature to create my own, but I feel like this portion would be/is mapped, and I just have a glitch or something like that. Anybody else experienced this, or is it normal?

LakeVu g3 with Navionics data. Unit is an Echomap UHD 73SV

Just be sure you switch to fishing charts from nav charts for the most details/contours.

Not sure though about your specific lake. Garmin website lists every lake included in their maps. I have not heard of partial coverage issue before.

Garmin tech support is top notch though!

Always keep it on Fishing Charts as far as charts go.