Larger Drone Buoy suitable as a full-size sailboat racing mark.  Starting pin is best application as it is likely within BLE range of the committee boat.
 
Weight 20 lbs
Height 51 inches
Diameter-tube 4.5 inches (5.0" caps)
Bumper width 14 inches
Battery type LiPo, 2S, 3P (8.4V)
Battery capacity 15 Amp-hour
Idle power consumption 130mA
Blue Tooth LE range 200ft
Radio control input capable (2-channel)
Number of GPS modules 2
  UBLOX Max-7C or newer (1.8m CEP)
MEMS 9DOF IMU
Brushless motors with stainless steel bearings
Warrantee:  One year