I see you decided to cheap out.
I think HP released this iPAQ 310 a bit prematurely. The initial reviews said there were a few half-baked features to it, some quirks to the routing, etc. By the time I bought mine in February there were a whole bunch of updates available which I installed. Never really worried experienced some of the problems in the initial reviews.
I checked for updates today and there's a new version of the companion software for the PC which I downloaded and installed, and it shows there's basically a whole new set of almost everything in the damned device save for the underlying OS and some of the landmark and 3D buildings databases. The navigation program, plus like every map, and every state POI database, and most of the text-to-speech data, a total of 1.4 GB worth, is available for updates. I'd say this should hopefully fix any remaining negatives.
That said, HP probably already screwed the pooch by releasing a product that wasn't fully ready to ship out the door, and all the reviews online will reflect those bugs. Not to mention that unless someone buys this thing, installs the PC software, checks for updates, and then decides to install all 1.4 GB worth, they probably will run around on the old version.
Oh well, cool product HP, I like mine, too bad you probably won't sell too many of em at a profit...