XtremeComputing posted a review on the Amaryllo ROOTS - USB, SiRFstar III chipset GPS receiver

Opps did I take a wrong turn, the device was accurate even why out in the wilderness, I wanted to test it more out there but the laptops batteries were dying quick. Still through out the testing the device remained accurate and the only time I couldn't get a signal was when I was in a basement. Which is to be expected.

Amaryllo ROOTS - USB, SiRFstar III chipset GPS receiver Review