RE: Radar or GPS
since i got a radar gun i'm craving to get a gps for the reasons of: 1) it's really hard and risky to radar the speedy boat if ur alone(..have a bad crash onetime)..2) radar gun round off the speed to nearest tenth compare to gps indicate the speed to decimal point meaning more accurate, 3)accuracy in radar gun depends on the angulation when getting the speed, the bigger the angle the less accurate, gps accuracy depends on the setting correspond to the position to the satellite. 4)though radar gun is more easy to use in smaller boat or rc car. 5) gps can measure the speed wether the boat is close to u or far unlike radar gun needs to be close.