read the note at the bottom of this thread:
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Use Basecamp and Mapinstall. Mapsource is even discontinued as written by Garmin developer cant handle fine new maps:
It's fine to use MapSource if you want, but do so at your own risk. I want to point out that the image creation code in MapSource is very dated. It might or might not work properly on the device. They have been dozens of fixes since MapSource 6.16.3 was released.

MapInstall should also be faster in image creation and transfer (depending on the type of map and device) because of performance improvements we made. MapInstall supports nMaps (more than one supplemental map), without having to manually rename gmapsupp.img. So the official recommendation is to use MapInstall, not MapSource. If something is wrong with a map on a device (mainly with routing) and you created the image with MapSource, I'd try again with MapInstall to at least eliminate one possible point of failure.

The ability to save map sets is an interesting feature, but is not currently supported by MapInstall. MapInstall does read which maps you have installed on the device and draws them on the map. So you could install one set of tiles, then reconnect the device and add or subtract some easily. It's not as helpful if you have several devices that you want the same selection for.

However, if you launch MapInstall from BaseCamp with data on the device, we will auto-select the tiles that you need to cover the data on the device (the data is also shown in MapInstall). Maybe that could be helpful.

Code:
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