iBlue821: i-Blue 821 Ultra-Slim Bluetooth GPS Data Logger (51 ch, Auto On/Off, WAAS, 150,000 Waypoints, 18 hrs) The new i-Blue 821 Bluetooth GPS Recorder at just 10mm thick, this BT GPS logger features an all in one, cost effective portable GPS logging solution. Ultra high sensitivity up to -158 dBm (Tracking) Smart Power Save Mechanism & Fuzzy Auto On/Off (Transystem Patent) 51 channels Bluetooth GPS. Slim & fashion look w/ 32Mb serial Flash, up to 150,000 way points