Does it have to be Garmin ?
I found many Tomtom's and Navman's will work with your head set.
I took my head set to a local store and had a play with the new models on display.
I found all the ones that worked with my head set then made a choice.
It was to be used in a car but I thought I should get one that could be a back up for my Zumo.
Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.