I just pulled the pin on a Garmin Zumo 390LM...Complete with two TPMS senders...Hellishly expensive though !!!!

If any Aussies are interested in purchasing my Zumo 550 complete with integrated TyreDog TPMS before I list it on FleaBay...send me a PM. (See pic at start of this thread)

If you are wondering why I am so keen on TPMS....wait till you have a front tyre blow-out at 100+K's...you will have your answer.!!

After doing a 800km off-road trip this weekend on very rugged and rocky roads, my impression of the is that it is a bit heavy. I shook and vibrated a lot and finally pushed the soft neoprene spacers (that I stuck under it for support from the dash) out and I had to take it off on Saturday. But at our overnight stop, I tightened the clamps and fitted new thinner spacers under the GPS AMPS bracket. It worked much better. We did some horrible roads (at high speed) and everything stayed put.
After 2 days of usage, the built in Li-Ion battery of the Montana is just above 30% still. One can program the battery savings mode so the screen switches off after a determined time and only comes on when you touch it or when you approach a turn in the road when in Routing mode.

Hi, great gps, I have one too.
What maps are you using? Garmin city navigator only works the 2010, newer versions slow down the device too much.

The problem is the device cpu which cant hold newer city navigator versions, since they are a bit heavier. I use topographic maps on mine to have it more updated just lost the routing capabilities which I didn't use too.. Thanks for the help! :)