Hi matt,
Thank you for your quick reply, and sorry for the delay in mine. Tried to post 2 times, but being busy and a corrupted Internet supplier gives me a hard time.
I would like to use, at least I thought it would be useful, the user map on the bathymetry map to define some possible fishing areas.
I want to view this map on my laptop, but then again exporting it to a different layer in the lowrance isn't that bad. I understand your suggestion.
At the time i wrote this it would be a logical function in rf to explore the map with a explicit depth range. Iso map does the trick well, but viewing in 3d gives sometimes a bit extra.
My holiday just begun, I will spend more time exploring rf I guess