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  LMS 339 DF iGPS Accuracy at low speed

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Author Topic:   LMS 339 DF iGPS Accuracy at low speed
wswillis posted 08-09-2006 08:01 PM ET (US)   Profile for wswillis   Send Email to wswillis  
I read the July thread on the LMS 339 DF iGPS and similar models. When looking for bottom spots I seemed to have more luck when initially arriving at the waypoint. Once I slowed down and started searching with the sonar I had trouble locking in. On the map or navigation page, it appeared that the boat was all around the waypoint but never right on. A West marine guy said I needed to hook up the Speed/Temp sensor and this would help at low speeds. Another sales guy at a different West Marine store said the paddle wheel had nothing to do with the accuracy of the GPS. What's the deal at low speed and finding a small spot? wswillis
davej14 posted 08-10-2006 03:04 AM ET (US)     Profile for davej14  Send Email to davej14     
There is NO relationship between the sonar or speed sensor to the location capability of the GPS. Location is determined by satellite signals received by the GPS antenna. In the case of the LMS339 this antenna is internal to the unit.

Check the status of your satellite links by the following key sequence:

pages>status>satellites

This screen will show you the signal level of the satellites that are linked to the GPS. Be sure that your satellite link is operating with WAAS.

Chuck Tribolet posted 08-10-2006 07:44 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Try turning off the map. Most GPSs have pretty wimpy
microprocessors, and get behind while repainting the page. My
Garmin 162 works MUCH better for nailing the divesite with
the map off.

And GPS accuracy has NOTHING to do with the paddlewheel.


Chuck

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