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.