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Vessel detectors
On many ships, you will find the alarms turned off (too many false
alarms) although this too is improving. To avoid many of these false alarms, either the inner guard ring is moved out to a range where small boats may not be detected, or sea return is turned up to a point that close in targets can be and are lost. Much of what is needed, is training and procedures. The Mates need to be trained to frequently check the screen (and not just rely on alarms) but also to scan the various ranges .... especially the lower ones. In most cases at sea, shipboard radars will be set on either the 12 or 24mi. range, for early detection (with "sea return" minimized for best reception) .... problem with this is that many small close in targets can be missed. otn Vito wrote: otnmbrd wrote: Maybe someday you'll be able to rely on all ship's having at least one radar on, but you'll never see the day when someone will be assigned to constantly monitor it, .... True. FWIW, the US Navy did studies that showed a skilled alert operator could detect almost all new contacts but that one's alertness quickly waned so that, after an hour or so detection became iffy. That's why we spent megabucks to develop automatic detection and tracking sustems. Also, the higher the antenna the longer the range but the poorer its ability to "see" small craft in the sea clutter, especially close aboard. So never, ever depend on a big ship seeing you. 73, K3DWW |
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