Hi All, I purchased a vent mount for my 340 XL. It fits to the louvers of the air con vents. I have been using it for several months and it works a really well. It came from the US and cost about $10.
Quite a few of my friends have made their own mounts for various makes of SatNav because (a) the original was not very practical and (b) replacements/alternatives are expensive.
I must admit that some of these 'DIY' mounts do not make for the best 'eye candy', but they are very secure. The best one was made for a TomTom where the original mount's sucker was not man enough and kept falling off the windscreen. My friend contacted a company that make industrial grade suckers that windscreen replacement companies use to hold the glass while they are fitting it to a vehicle. The rubber cup is large with a chunky lock bar, but once its on it certainly wont come off by accident!! My friend used the original bracket and screwed that to the new suction cup. Again... it looks a bit 'clunky' but is VERY secure.
I agree about the TOM TOM Vent mount it is great for holding the TOM TOM securely. The Bad news is that it does get in the way of the air flow so the unit get quit cold when you turn the air con on etc. I think the good points out way the bad ones.
I drive a Nissen Patrol and have successfully used self adhesive velcro to mount my XL 540 onto the small shelf in the dashboard. This not only keeps it within easy reach and vision but also stops the sun from beating on it which I have read, decreases the battery life. It is very easy to rip the velcro off and hide the unit when I leave the car.
The factory TT mount is very good looking but unless it is well secured it does have a habit of falling off...
I found that, and I haven't gone anywhere with it yet.
However, it seems to me the instructions are a bit wrong. They seemed to indicate that you turned the base locker in one direction, which I did and it wouldn't stick for more than a couple of minutes. So I tried turning the base locker in the opposite direction and bingo. Works a treat now!