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Hi,

I am writing custom mapping tools for use with the Garmin Area 796 aviation GPS (the most recent hw/sw versions) and I have a unique requirement.

I have IMG files that define our survey lines, but depending on the day sometimes I want to see IMG 1 for an hour and then IMG 2 for a while (without being cluttered with IMG 1 anymore).

I know I could produce separate gmapsupp.img files for each use case and put them on different SD cards, but this doesn't scale to the 6 or so layers (IMG files) I want to produce and update daily before we leave the office.

The 796 has a Map Info page where you can select an 'map or mapset' by a given name (but it usually just says cGPSmapper version0100d - which I do a binary search and replace on to the name I want).

The problem is that if I load 6 IMG files into the SD:\map directory they all render ok, but only 1 of 6 show up as a show/hide option on the Map Info page. 

Has anyone run into this before?  Is there another way to load several IMG files without combining/joining them to be able hide/show them at will?

Thanks,