Futaba SBS-02G GPS Sensor. (Replaces SBS-01G)

Sbus Telemetry GPS Sensor

Displays altitude, distance (surface and slant), speed and rate of climb/descent.
Features built-in atmospheric pressure sensor. 
Weight: 0.375 oz (10.7 g). 
Speed: 0-311 mph (0-500 kph)
Altitude: -766 to +6015 yd (-700 to +5500 m)
Variometer: -336 to +336 mph (-150 to +150 m/s)