I have seen moans on here about the mounts for Garmin being poor. I have had problems over the last four years with the mounts wearing out after a time. Over some Belgian cobbles in July I was trying to ride with one hand on my Dakota as I rode - not ideal. I have tried cheap copies which sometimes do not work at all or paid extra for Garmin's own mounts. I have also with some success used Aidan Harding's Araldite solution:
http://www.aidanharding.com/2012/02/how ... ike-mount/
In July I was in Belgium for the start of the Trans Continental Race and got talking to a Dutch guy, Eelco, who was just back from riding the Trans America race. He had a Softplate system on his bars which he said worked well throughout America and I saw his setup. He said it never ejected from mount although he used the lanyad just in case.
This is the website:
http://softplate.nl/
At the time they showed a UK supplier who I contacted but they did not stock the product. Talking to a guy at Ram Mount UK who did cycle ' on a hybrid' they had two solutions. One was an EZ-On which attached with zip ties and he did not initially recommend for off road. Talking a bit further I think he confused me with Steve Peat - a mistake easily made;-) and he did not think it suitable for 40mph downhill off road! I decided to order one anyway (RAP-274-1) plus a more substantial unit with a U bolt (RAM-B-149) as I have a number of bikes and could switch over easily enough. You also need a cradle which differs depending on your GPS model so for a Dakota it is RAM-HOL-GA36
Website here:
http://www.ram-mount.co.uk/gps-handheld ... 9_659.html
On receipt of items I found that the U bolt item only fitted the old standard narrow bar (25.4mm?) and would not go around the wider standard. It was also a bit heavy so I returned it. I have been using the zip-tie EZ-ON for a couple of weeks including a trip to France and Belgium and it was fine staying in place and thinkk it would be fine for bikepacking speeds. (I found RAM Mount UK a good company to deal with for advice and returns)
I then ordered directly from softplate.nl a mount which has arrived and I fitted it yesterday. A bit more low profile then the ziptie option and I think (not tried it yet) it is just a case of undoing two screws and it will swap between bikes quite easily. It also has some inserts so that you can use on both size of bar standards.
It is not a cheap option but looks more reliable then the Garmin mounts. Cradle is £12.10, EZ-On is £10.50 + postage. The option of softplate 80 euro (with postage) and you still require a cradle for your device. They do not stock all cradles and cost is 15 euro.
Pic of EZ-On:

Pic of Softplate (1):

Pic of craadle from top:
