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rhys wrote in
: Agreed, and I know what you are getting at. But if seas are flat, wind is calm, and you are on a misty seaway at dusk/dawn motoring at five knots under autopilot, I can see where a trawler or small frieghter doing the same on a reciprocal course would be nearly invisible to you simply due to the fact that your radar's proximity alarm or "range guard" or whatever they call it would not go off until the ship on the collision course was on top of you...solely due to the mizzen placement. If the radar antenna were a point source of RF out and back, this might be true. But, it's not a flashlight. The flat panel PC board planar array of the 2KW Raymarine dome is about 2' wide. The whole panel radiates and receives RF, so it's like having a set of "eyes" on the mizzen that are 2' apart. Could you see around the mainmast to all targets, the mainmast being 20' away from you with this "eye" arrangement? Yes, it works, even on small bouys 3 miles away. I've swung the boat through each degree very slowly to see if the bouy I could see off to the side had a blind spot dead ahead. It didn't. The panel isn't a point source like a flashlight. It's more like a 2' diameter floodlight shining past the mast, illuminating the target dead ahead, but probably with some loss of efficiency. |
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