G'day stevenboats, welcome to GPS Power.

[Only registered and activated users can see links. ] is not available as a PC Install version, so you should have an original image on the SD:
Info:
Code:
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Check first that it is in fact an image file chart. If it is it's probably in a folder Garmin named gmapsupp.img. Perhaps it's locked to another unit in which case it can be unlocked with [Only registered and activated users can see links. ].

If it's not an img file then it may have been reverse-engineered from an img file to make an installable map for use on the PC. Post again with details of what's on the card exactly if need be. [I guess you've bought it off ebay maybe].

PS: Best don't make more than one post for the same assistance.