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AIS Receiver Range Record?
Phil Stanton wrote: Come off it , amateurs. I hold the record. Frequently get ships about 3200 miles away. Odd though - distance from here to the line where the Equator crosses the Grenwich Meridian is about 3200 miles. Joking apart, here in the UK, I have freqently found ships displaying duff information, and I suspect that if their GPS is not working, they display their position as zero degrees east and zero degrees north. In fact on Saturday I saw a freighter goind up the Thames, but announcing she was in the way to Liverpool. The previous week we were watching a Roll on Roll Off ferry, 400/500 foot long with no AIS signal being broadcast. It is a brilliant system, but always to be used with a pinch of salt. They seem to congregate off the coast of Africa, don't they? The position indicating no input is 91/181 and some software doesn't check properly so it sets the position to 0/0 I once spotted a cruise ship going through Admiralty Inlet that jumped sideways every couple of miles. While talking to a USCG guy I found that they were experimenting with a new GPS system that wasn't working all that well. ..cp |
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