Hi Phylymann, Recently bought one of the new tomtom go 300`s for our swift suntor 600s, tried to use the suction mounting device to lock it onto the facia, but due to the somewhat dimpled effect of the facia it would`nt adhere in any way.
So eventually decided it had to go on bottom of windscreen, and eventually ended up slightly to the left of the steering wheel, and about three inches from bottom of screen, tried several positions before this but seemed to get some reflection and glare on the screen from elsewhere.
Did also find, dont know if you saw my other mails, that I needed an external antenna to pull the sats in adequately, but anyway find this position seems to suit me best, hope this helps.
I have tomtom go which I mount directly onto a smooth bit of plastic by its suction pad this bit of plastic is then clipped under the spring clip on the top centre of dash (fiat ducato). Some peices of the "furry" side of velcro stop the peice of plastic from slipping when in the dash clip. The other thing is the clip is closer to us than the w/screen.
Also the advantage I've found with this is that the suction pad on the TT mount is easier to release from my peice of smooth plastic. I've found it a pain releasing it from the screen because of the similar sized base of the mount that directly covers the suction cup.
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