Polstar iGeo-Pro PBT-648- Page 3
Polstar Technologies recently entered the SiRF III chipset race with the introduction of the PBT-648 GPS device. As we expected, the performance was very good in all cases, matching that of the Globalsat BT-338. The device doesn't have any obvious weaknesses, but one shortcoming is that you cannot connect an external antenna.
The retail price of US$100.00, makes is comparable to the Globalsat BT-338. There are no major problems that we could see, so it is up to users to see which device best suits their needs.