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It seems from my research that you need to use a file of the .GMAP (.gmap) format. This is not to say that other formats will not work for certain, but this is the format that I turned up as compatible with your outmoded Garmin model.
Let me know if I can help you further with any detail of this question. And if this completes the case, as far as you are concerned, please rate my Answer, so that the case may be closed. Thanks.
There are such converters. But, what computer are you going to be doing the conversion on, a Windows PC, or an Apple computer ? the programs differ.
As for conversion to .gmap on Windows... it depends upon what specific file type(s) you want to convert. (Admittedly there seem to be more conversion programs for Mac/Apple computers than for Windows PCs.)
JaVaWa is mentioned as a program for map conversion, but perhaps not the type you are looking for. So tell me the map types (just a few of them at least) that you want to convert into .gmap format, please.
is a program that can do some map file conversions... perhaps it might help, I'm not sure.
At least it is a Windows-compatible progam, unlike most map conversion programs I found upon searching, which turned out to be for Apple/Mac computers only.
Was the Garmin Data Card readable at all? it might be too large or otherwise unusable in whatever card reader / computer combination you tried.
There is a cd with it which has drivers
What is the title of the CD, on its label, please? (I'm not clear as to how the CD might appertain to this case, exactly.)
What version of Windows is on your PC ?