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Originally Posted by Orion2012
Now my question, is there a blind spot behind the boat with the SD radar, (finally earned the 1500 renown!!) I ask because I had a Zero come out of nowhere at a bearing of 180-185 or so, and didnt even know it until the watch crew spotted him. If it does, running at PD with the mast of it up, is gonna get me killed, so I thought I would ask.
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As Peto said, SD radar has an altitude below which it will not pick up contacts. For the early SD this is 1500 feet, for the SD-1 it is 1000 feet. Otherwise, it will pick up contacts from any bearing, provided they aren't below that altitude. Also note that each radar (and sonar) set has a detection probability value (designed to simulate equipment malfunction or operator error). For the SD-1, this value is 95%, so it may have been that your radar antenna simply didn't pick up the contact, even though it was within range and at altitude. Also, do note that the early SD radar set has a maximum range of only 6 miles, so its use is somewhat limited.
BTW, all the pertinent data about radar and sonar can be found on the Weapons and Sensors page.