Any navigation software needs a GPS source, and with Bluetooth built into the PPC the obvious solution is a BT GPS unit. I read the write-ups here, and over on gpspassion.com. The consensus was that the STARIII chipset will be the most accurate, esp. in built up areas such as mine. I went for the Seidio RBT-2010. As i found out when installing the battery, it's actually a rebadged RoyalTek unit, but comes with a longer lasting battery, 1700mAh, which translates to 15+ hours of battery life.
Out of the box, the first thing to catch my eye, was just how small these things are. I am used to handheld Garmin or Magellan units. On off switch a plus, external antenna connector major plus. That allows me to "hide" the unit anywhere in the car down the road and simply mount an external antenna.
From the pics, you can see the colored LEDs. Bluetooth notification, charging info, and GPS lock. Much easier to glance at these lights than check your PPC.
I placed the unit outside for a clear shot of the sky, and came back in a few minutes to see it had acquired already from a cold start. No drivers need on the PPC, I enabled bluetooth, and added an outgoing port under bluetooth setting, I went with Com4. I fired up iGuidance and under GPs setting selected Com4. Under the GPS info (see screenshot above) the info data coming across. Even in my garage under a 3 story condo it picked up enough satellites to get a lock.
This sensitivity translated to the car too. My first drive with the unit, i had in the glove box, and it still worked. This allows me to keep my install even cleaner, no GPS on the dash. I did test in on the dash however, and the signal is improved, I suppose in a snow storm, under tree cover, or in a city downtown you would want it out with a clear view. It is well suited to dash work, as it included rubber feet, so it wont slide around while you take those corners in a four wheel drift .
An important spec is acquisition time, for me it was within seconds. I could turn the unit on, and fire up iGuidance, and the connection was made.
the removable battery has a couple benifits. First you have the option to carry extra batteries if you are camping or using in a situation where you can't get to a computer, car or electrical outlet to charge it. Also, if you hardwire the receiver into the car, you can leave the battery out, and the switch set on, that way each time you startup the GPS is ready to go (without draining the battery).
The GPS comes with a double function charger, a wall adaptor with a USB port on it, the supplied USB to 4mm cable then connects from the adaptor the unit, or straight from a computer USB port to the unit. I suggest picking up the 4mm to 4mm cable to alow you to charge it from the G4500 cradle.

+ves:
Long battery life.
On off switch.
External antenna connection.
Removable battery.
Clear LED display.
Rubber feet.
Quality chipset and internals.
Matches modern car interior.

-ves:
A mini USB port for charging would be even better.
No auto off.