You can check the contour coverage of your lake in the Navionics webapp here ...
Navionics ChartViewer
You can check if LakeMaster (only HB compatible) has HD contours for you lake here ...
https://www.humminbird.com/support/chart-lists
Rickie
What maps are most of you running on your depth finders. I am thinking about going with navionics.
GrumpyLoomis LIKED above post
You can check the contour coverage of your lake in the Navionics webapp here ...
Navionics ChartViewer
You can check if LakeMaster (only HB compatible) has HD contours for you lake here ...
https://www.humminbird.com/support/chart-lists
Rickie
www.podunkideas.com <--Click here
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https://www.crappie-gills-n-more.com/
https://cornfieldfishinggear.com/
------------------------>> Pro Staff Sonar AdvisorHanr3 LIKED above post
I use the map that came with my Hook 7 ... I did have a map card for my Lowrance Elite 5DSI, but never really got much use out of it before the unit got "broken". I'm actually more satisfied with the plain blue background map, because it doesn't have a lot of icons on it to start with ... and I can easily pick out the waypoints that I've put on it.