Attention MAC users: Some Garmin GPS units have an Android Operating System, and cannot be accessed on a MAC computer.
(Note: the unit is accessible on a Windows PC).

If you are purchasing Downloadable GPS Maps from us, you will need an SD Card. Complete instructions are sent upon purchase.  
You will need to write an image file (.img) to an SD Card, which will then be inserted into the Garmin GPS unit. (ie. This will be done via an SD Card reader/writer or via an adaptor slot in your MAC if there is one). 
The minimum SD card recommended size = 4GB.

For more information on which Garmin GPS units are not compatible with MAC computers see here.

Tread XL Overland Findings:

1. Works with plug and play SD card.
2. Is picked up by MapInstall/BaseCamp/Express
3. Route and POI transfer from BaseCamp works per usual. Just on the Garmin have to import waypoints and routes to “trip planner” and “waypoints” from gpx, which it picks up automatically. NOT THROUGH GARMIN EXPLORE. It does not have it. It works the same manner as the Zumo models.
4. It has a track recorder App similar to the Overlander, which you turn On/Off. Weare assuming that transferring tracks from the Tread to BaseCamp wil work the same as above, just opposite.

ONLY EXCEPTION:

When you plug the tread into the PC (without an SD Card Inserted) it picks up two separate drives inside the Tread.

This causes MapInstall to pick up the storage as (Internal Storage + SD Card) even though there is no SD card inserted. There is no choice presented to choose between the two drives in drop-down box, similar to the Montana connection in MapInstall.

If you then send a map set to the Tread via MapInstall, it sends the maps to a “Map” folder on the second drive.

Then, if the tread is switched on, the maps don’t appear in “MyMaps”.

However, if you the copy and paste this image file into the “Map” folder of the first Drive via the PC, then it is picked up in “MyMaps” on the Tread.

• Recommended size:
  • You could get away with a 2Gb card but maybe 4Gb is safer if you want to load additional files such as our GPS Africa Guide.

• Formatting an SD Card:
  • It must be formatted to FAT or FAT32. Either will work, but the recommended option FAT32.

• Basecamp is calculates routes incorrectly, or routes and times are wrong
• Routes and times are incorrect on a GPS unit

• Basecamp and your Garmin GPS must have the exact same maps loaded, i.e. the map you used for calculating the route in the first place must also be on the GPS
• Uninstall all versions of T4A from your Garmin and BaseCamp. The old and new versions respectively.
• Then do a fresh install on BaseCamp of your T4A GPS Maps.
• Then recalculate the routes on BaseCamp and then send them to your Garmin GPS.

• The GPS will always recalculate the route once loaded (on some units you have to import the route after transferring it).  For this reason the route calculation settings on the GPS and your Basecamp software must also be exactly the same else you will get different results.  E.g. if you use Shortest Distance on Basecamp then GPS must also be set to Shortest Distance (these settings are not transferred to the GPS)
  • In some cases it simply does not work.

• If you succeed in transferring a route and you select this route then your GPS will now try to get you to the start of the route. If your starting point is different from what you calculated on the GPS you will have to recalculate the route from your current location.

• In Basecamp, under your activity profile, check if any of your "avoidances" are ticked? We do not have Interstate or State Highways in Africa, and if those are ticked, it causes problems when trying to do routing in Basecamp. The best is to untick all of them - go to your activity profile and click on the arrow, right at the bottom  you can "edit activity profile" and the options box (screenshot below) will open up. Select activity profile and then go to routing, to see which avoidances are switched on. Note that if you have one profile for driving, one for motorbike, and one for hiking, you will need to untick it for each activity profile.

• If you do have avoidances ticked, please untick them and click on OK - now try the same route again, and see if the map still re-routes you on a detour for no reason.

• Sometimes we have tracks in a concession area, where one may only travel with a guide, e.g. the northern section of the Skeleton Coast in Namibia. So we have the tracks in the map, so you can still do planning for this area if you want, but we put a break in our roads, so you cannot navigate directly into this area. There is usually also a waypoint here that says "permit required" or "no entry north without guide".

T4A Garmin Image File Installation for the Garmin Overlander

1. Insert SD Card into Adapter into a computer
2. Format the SD Card. Verify File System is FAT or FAT32
3. Create a folder with the name “Map” on the SD Card
4. Copy the T4A Traveller's Africa ######.img file into the Map folder
5. Remove the SD Card from the computer and insert it onto the Overlander
6. Restart the Overlander
7. Navigate to “My Maps” in the “Settings” menu
8. Make sure the T4A Map displays in the list of maps and that it is checked as active
9. Deactivate all other City Navigator Maps (CN) for Africa. You can leave the DEM Maps active
10. Tracks4Africa data should now be active and visible when viewing the map