I have tried saving to SD card and to the unit with no joy. Now that you ask the question about naming, I ma y ahev the answer. I am naming to note the map content whereas I guess it should be GPMASUPP.IMG.
If I am correct then thank you for pointing me in the right direction. If not can you advise how I should be naming the file.
If I use GMAPSUPP.IMG will I still need to add a GMAPSUPP.URN to the unit/card to make it work.
Thanks,
Steve