Maps on Garmin 680 device are not visible.

General talk
1

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.

2

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. http://garmin.openstreetmap.nl/

You can change the family id of a map with tools, e.g. GMapTool
http://www.gmaptool.eu/
or JaVaWa tools:
http://www.javawa.nl/jdm_en.html

BTW: This is the OSM forum, there is a special forum for Garmin maps:
https://forum.openstreetmap.org/viewtopic.php?id=2625

Gerd