I would again think that you must tell Garmin app what com port and at
what baud rate your internal gps is operating at in order for the app to
find it.There are are a number of free apps to find that info or read your
fones operating manual.Better still if anyone here has the same fone they
might volunteer that info.
Here's a great start to find your answers,some say Com 0 works for some
apps:
HTC fuze GPS - HTC
Here's another article about the Fuze and gps.
The HTC Fuze has an internal GPS with aGPS (location positions are aided by cell tower triangulation). The phone has HTC's usual QuickGPS which downloads satellite data weekly to speed positioning, and there's an aGPS applet that turns on/off aGPS (we can't think of a reason to turn this off since it really speeds up location fixes and doesn't use data). The PDA phone comes with an icon that leads you to the full download of AT&T Navigator, formerly named TeleNav. Even if you don't intend to use TeleNav, download and run it once (it will run in free trial mode for 3 days). This sets up the GPS for use and is your path to success for using other GPS programs such as Google Maps, Garmin XT Mobile or other navigation applications.
For those who are interested in AT&T Navigator, it's an excellent mapping and navigation application with spoken turn-by-turn directions. TeleNav's maps are accurate, routing is logical and expedient and maps download quickly over 3G and decently fast over EDGE. Navigator does require a data plan since maps and POIs are downloaded over the data connection, and the service itself costs $9.99/month or $99/year. While some folks hate paying monthly fees, the good part is that TeleNav is constantly updating their map and routing data, so it's always up to date. Likewise you need not use a PC sync or special microSD card to have the maps you need. Of course, if you travel to the far reaches of never-never-land where even GSM and EDGE aren't available, Navigator won't work.
The Fuze, like the GSM Diamond, isn't the best at getting a cold fix (in layman's terms, that means finding your location after the phone has been rebooted). Most phones with aGPS can get a fix in less than 30 seconds indoors near a window these days, but the Fuze had to be outdoors and then it took more than a minute to get a 3D fix. Subsequent warm starts were much faster (10 seconds), so this is an issue only after rebooting the phone. Once it found itself in the world, the GPS managed to keep up with us when driving, and didn't experience much lag