Marine radar comparator — Skysat

Not necessarily. If the magnetron starts, detects at 24 NM, and you primarily sail offshore, the Solid State investment is not urgent. The switch becomes relevant when you sail at night in busy coastal areas (Doppler changes traffic reading), when your 12 V battery bank is under strain, or when the magnetron reaches the end of its life (typically 10-12 years).

All Solid State Doppler. HALO (B&G/Simrad) = sailing-oriented, native integration with H5000 and Zeus. Fantom (Garmin) = longest raw range (up to 48 NM) + highly readable MotionScope colored Doppler. Quantum 2 (Raymarine) = lowest power consumption (~17-20 W), most compact, unbeatable for retrofitting on existing Axiom.

Yes, but not exactly like an alarm. Doppler does not say "this target will collide with you" but rather "this target is approaching relative to you" (red) or "moving away" (green). It provides relative speed information, not collision path data. On deck, the eye instantly picks up red targets against a green background.

Over 24 hours of continuous navigation, a 4 kW magnetron typically consumes 600–900 Wh depending on the transmit cycle. A Solid State Doppler unit drops to 400–700 Wh, a 25–40 % saving on the radar load.

No. AIS receives the GPS position declared by other transmitting vessels. Radar detects what reflects waves: anything that floats, including non-AIS boats, drifting containers, coastlines, and squalls. The two systems are complementary.