Question about Northstar 951XD GPS Receiver

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Northstar 951 GPS shows boat moving & @ high speeds (over 100)

Unit will function fine, then it will show boat moving in different direction than actual heading w/speed increasing even while docked.

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RE: Northstar 951 GPS Receiver

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Posted on Feb 22, 2009

  • Sam H. Jan 07, 2011

    You probably need the latest software update. It can only be done with a PC that has a serial port. USB Converters will not work. The update has to do with the PRN32 Satellite.

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I had the same problem. I talked to 3 different technicians on the Humminbird support line about it. All 3 of them confirmed that this is how their technology works. They ping the GPS satellites continuously, and at low speeds the GPS accuracy causes the speed measurement to fluctuate wildly. It smooths right out when you go faster than 3 MPH, since your boat moves far enough at that speed that the GPS accuracy is no longer a problem.

Seems like they could easily overcome this issue by averaging GPS readings over a longer time period at low speed (i.e. give the boat enough time to move far enough to eliminate the accuracy issues), but they don't do that.

It was a big issue for me since I do a lot of trolling at low speed and need an accurate speed indicator, so I returned the product and bought a Lowrance instead. Lowrance doesn't have this issue.

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