Furuno’s Doppler system, known as Target Analyzer, automatically changes a target’s color depending on the threat level. Anything stationary or moving away from the boat is green. Targets moving toward your boat at 3 knots or more become red.
“With the radar’s ARPA (automatic radar plotting aid) on, the red targets also get an echo trail, and an audible alarm is sounded,” says Eric Kunz, senior product manager for Furuno USA. “There’s no need to set an acquisition zone; the ARPA automatically shows the vector, closest point of approach, and time to closest point of approach.”