The GPS version of the maps will work in the OpeSource desktop application known as QMapShack (this is the nearest that you can get to Basecamp on Linux, without installing WINE and trying to get BaseCamp to work via that).

You can find out more about QMapShack via the links below:

• https://wiki.openstreetmap.org/wiki/QMapShack
• https://github.com/Maproom/qmapshack/wiki

You can install QMapShack via your usual way on Linux, e.g. for Ubuntu you would use the following command (as root):

• apt install qmapshack

There are also Windows (64 bit) versions and Mac versions available too; although I would suggest using BaseCamp instead as it offers more features on those operating systems.

Once installed it can be set to read the folder where you have map files in Garmin IMG format (single map files, not single map tiles).

Here are a few screen shots of QMapShack (running in Windows 10) showing my British Isles map:

Please note: That although it pretty much renders the map the same way as on a Garmin device (or in BaseCamp) there are some limitations in the way that QMapShack works, these include:

• It will not read BaseCamp versions of the maps, only the GPS versions.
• DEM data in the map is ignored (you can use QMapShacks own DEM features instead).
• Most POIs are selectable, but some are not rendered correctly (not sure why).
• The routing in the IMG file is ignored, so creating a route in QMapShack will not use the routing data in the IMG file. If you create a Route without using one of QMapShacks own routing methods (offline or online) you will end up with straight lines (as the crow flies) routes.
• The Detail setting should be set to 5 (otherwise not all the available data will be shown).
• Make sure the Opacity slider is set correctly or the map will be invisible!