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problem with simrad radar - or mount...
David Rinnan wrote:
Hi Bruce, Thanks for all the information! Just to make sure I understand this.. When you say "look at the way the bearing data is generated" are you then refering to the GPS, in my case, since I havnt installed a separate compass yet? It is not about the GPS, he is talking about bearing as in the direction the radar's rotating radiator or antenna is pointed (relative to the center line of the boat). That bearing is the direction the radar pulse was sent to and received from. If that bearing display is off, the relative bearing to a radar contact from the boat would incorrect. Does your boat have a flux gate compass? A boat with a radar system and/or a autopilot really should have a flux gate compass for determining the boats bearing when not moving. A flux gate compass knows the bearing at all times (boat moving or not) and sends it to other devices as a NMEA sentence. If you do not have a flux gate compass your radar has probably been set up to use the heading data from the NMEA sentences from the GPS. GPS headings are only reliable when you are moving, they float around when you are stopped and do not stay relative to the bow of the boat. In the above I use heading and bearing as follows: heading - the direction the boat is moving bearing - the direction the bow of the boat is pointing Some people will want to argue about the terms and their use but I'm not likely to indulge in discussion about it. :) There are many different definitions and schools of thought on some navigation terms and none of them are wrong. Jack -- Jack Erbes in Ellsworth, Maine, USA (jackerbes at adelphia dot net) (also receiving email at jacker at midmaine dot com) |
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