http://gcaptain.com/ais-check-your-gps-offset-for-errors/?755 Wed, 08 Feb 2012 23:08:17 +0000 hourly 1 http://wordpress.org/?v=3.3.1 http://gcaptain.com/ais-check-your-gps-offset-for-errors/?755#comment-4839 Thomas Bailey Sun, 02 Dec 2007 01:06:59 +0000 http://gcaptain.com/maritime/blog/ais-check-your-gps-offset-for-errors/#comment-4839 Maybe the waypoints listed on the ship's log were in the wrong datum. Perhaps the coordinates listed are in NAD-27 and the ship's GPS uses WGS-84. There might be an error in the north reference, with the captain reporting magnetic and AIS reporting true bearings, a 17-degree difference. There was a report of the captain being unfamiliar with the ship's navigation equipmant, which should be standardized. Maybe the waypoints listed on the ship’s log were in the wrong datum. Perhaps the coordinates listed are in NAD-27 and the ship’s GPS uses WGS-84. There might be an error in the north reference, with the captain reporting magnetic and AIS reporting true bearings, a 17-degree difference. There was a report of the captain being unfamiliar with the ship’s navigation equipmant, which should be standardized.

]]> http://gcaptain.com/ais-check-your-gps-offset-for-errors/?755#comment-13866 Thomas Bailey Sat, 01 Dec 2007 22:06:59 +0000 http://gcaptain.com/maritime/blog/ais-check-your-gps-offset-for-errors/#comment-13866 Maybe the waypoints listed on the ship's log were in the wrong datum. Perhaps the coordinates listed are in NAD-27 and the ship's GPS uses WGS-84. There might be an error in the north reference, with the captain reporting magnetic and AIS reporting true bearings, a 17-degree difference. There was a report of the captain being unfamiliar with the ship's navigation equipmant, which should be standardized. Maybe the waypoints listed on the ship’s log were in the wrong datum. Perhaps the coordinates listed are in NAD-27 and the ship’s GPS uses WGS-84. There might be an error in the north reference, with the captain reporting magnetic and AIS reporting true bearings, a 17-degree difference. There was a report of the captain being unfamiliar with the ship’s navigation equipmant, which should be standardized.

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