OK, if Humminbird depth finders are Navionics compatable, and Lowrance is Navionics compatable, can a Humminbird finder (597) read the same Lowrance Hot Spots maps that my Ifinder GPS uses? I am tired of having to buy new maps all the time.

I don't care of the GPS coordinates that I have saved will transfer or not, I just want to use the Hot Spots maps that I already have if I can.