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95% (or so) of GPS users do not need one. If you find that your GPS (regardless of what brand it is) loses it's tracking position with any kind of regularity, then you either have a weak GPS circuit in the unit itself (it does happen and is covered by warranties) OR more likely you fall in that...

Sorry. They are kinda buried under the dash mounts at this page: http://www.dieselboss.com/mount_for_gps.htm Also, note that the round hole in the back of the Rand TND710 model is TINY so you have to wallow it out very slightly with a drill bit or something similar to get the connector through...