Having owned many Garmin products over the years for everything from boating to flying I have to say that the ZUMO 350LM is the biggest piece of excessively overpriced junk in their stable. In addition to useless "apps" and a memory wasting, unintuitive interface... It now freezes every few miles necessitating pulling over to do a reset just to gain a few more miles of insight. Use of this unit never quite felt right or as fluid as every other model I've used. Navigation of it's interface is counter intuitive, clumsy, and aggravating. Garmin received an email service request from me earlier so we'll have to see how they handle it. In the past any service I've required has been handled properly, but conspicuously missing was any mention of error or fault on the mfg/design side. This is also reflected in their FAQ's as a cross word cannot be found on their site. Positives only. Thus no help whatsoever. Updates to follow. How I wish I never sold my 450.