Is it possible for a Pocket PC to have GPS navigation functions by simply installing an off-board navigation software and adding an external GPS receiver? I was thinking to download the Nav4All off-board navigation software, which is originally designed for cell phones, and installed on my Pocket PC, yet I'm not so sure if it's gonna fit, I mean, I know even some cell phone models don't work properly after installation of Nav4All, such as Nokia N70, but is it okay at least in theory, that Nav4All can also help Pocket PC to pinpoint the holder's location?