Navizon - does this work?

Have some across a product called Navizon that offers peer to peer wireless positioning. Basically, you download it to your PPC or Smartphone, register online...and you can see yourself and your other contacts on a map. it works with GPS or Wifi or GPRS.

Not sure it would work well without GPS but I have not got it working at all. The concept is kinda nice, but the implementation is not good. Tried to get it working for an hour...but no joy.

If anybody has got this working, then please let me know!