You probably have an early version of Garmin WorldMap. The first series of GPS maps from Garmin was not installed on the hard drive and you had to use the CD to get the map tiles data. In those days hard drive capacity was quite low and expensive so Garmin made the choice to keep the data on the CD. The second generation of Garmin maps offered the possibility to install map data locally on the HD or leave it on the CD. Now since some years back in time it's more or less mandatory that map data is copied from installation media to the hard drive.

Either install a newer version like Garmin WorldMap v4 - [Only registered and activated users can see links. ]

... or ...

You can also try to check the Windows Registry settings for the product.
Start "regedit.exe" in Windows and go to "[HKEY_LOCAL_MACHINE\SOFTWARE\Garmin\Mapsource\Families]" in 32-bit Windows or "[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Garmin\Mapsource\Families]" in 64-bit Windows.
Look for the WoldMap product (v2? or v3?). It's likely that the "Loc" sub-key points to a location on your CD. You have to copy data from that location and store that locally on the hard drive. Good choice would be the same path as IDX, MDR, Bmap and Tdb files. Then you have to edit the "Loc" sub-key to your local hard drive path that you just used to copy map data to.

Here's an example for WorldMap v4 in Windows 64-bit environment. It's the "Loc" key that holds the path for map tiles data:
Code:
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