On Mon, 29 Mar 2010 08:29:52 +0100, Mike Lane wrote:

Couldn't you simply test this for yourself? First check if the power cable
physically fits the socket on the mount, then measure the voltages on each
pin to see if they're the same.

The zumo power cable is thousands of miles away at my friend's home.

Garmin support contacted me.

They said the power cable is the same for the zumo as for the numi.

Thanks everyone!