Is it possible to to put GMAPSUPP.IMG to an SD card instead of my GPS device (running low on space)?

If I can, since I already have GMAPSUPP.IMG on my device, should I rename GMAPSUPP.IMG to GMAPSUP2.IMG before saving to my SD card?

Thank you very much. I have been trying to find the answer everywhere before asking. Your kind assistance would be greatly appreciated :D