GPS Data Logger Software - BT747

I got a CanMore GT-730F(L) GPS Dongle with Data Logger to have a hands on evaluation of a device with a Skytraq Venus624 GPS inside.  I was pretty surprised to find that it did not have a battery allowing it to log positions without USB power.  The performance on my desk is not exceptionnal compared to the iBlue 747 A+, but for the moment I blame the design for it - not the chip.