BT-Q818 extreme is the most powerful GPS receiver on the entire planet? We're guessing not, but for what it's worth, the second edition  of the BT-Q818 features

• 51-channel tracking,
• 32-hours of navigation time,
• 158dBm sensitivity,
• USB connectivity,
• built-in Bluetooth,
• adjustable 1 to 5Hz update rate and a
• 36-second signal acquisition time (when cold).