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There actually was a pretty big error...the technique used by Raytheon to
flag bad data was different then the one the bridge system was using to respond to bad data. In my view as an electronic systems guy that was a very big error...particularly in a system that could lead to a people/property hazard. I agree though that it should not have been so significant because there were multiple other ways to catch it in this case. But I could postulate cases where it could be quite serious quite quick. In the heavy boat business I would have thought two or three GPS receivers would be standard aside from any additions like LORAN. Three is a little magic because it almost always allows you to isolate the mis-behaving unit. I don't think you can integrate radar into such a system. You can show the picture or the picture enhanced but the software to match a view to a map would be very difficult. If however you know where you are (or think you do) it is possible that you might match the patterns. Cross check perhaps...but quite sophisticated software. Of course your people can cross check radar and fathometer. If you can keep them focused to do so. A known hard problem. Jim "otnmbrd" wrote in message ink.net... Jim Donohue wrote: So we actually agree? The system was seriously flawed but the Crew should have caught it anyway as there were multiple and pretty obvious indications that competent sailors should have caught. Jim G To a point. I don't think the system was "seriously" flawed, since SOP and good training should have caught it, with the system as is/was. I tend to use "competent" in a stricter sense .... they may well have been competent mariners, but they sure screwed up. If I have a beef, it would be (as expected) with simply doubling up on GPS, especially on approaching Nantucket. Although a 2nd GPS would be nice (and generally standard), I would still prefer that double checks would involve different systems..... Radar, Loran, Fathometer, Visual..... when available. otn |
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