Maps on Garmin 680 device are not visible.

I have downloaded a few maps to BaseCamp and transfered them to my Montana 680 GPS. The last 3 maps I have transfered are not visible on my GPS, but are in the Micro SD Card. All the other maps that I have transfered from BaseCamp to the GPS work fine and are visible, exep the 3 last ones that I have transfered. All of the maps transfered are in the Micro SD Card.

When you have multiple maps on the SD card they have to have different family ids. This is not the case when you download
multiple maps from e.g.

You can change the family id of a map with tools, e.g. GMapTool
or JaVaWa tools:

BTW: This is the OSM forum, there is a special forum for Garmin maps: