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alan_sh Lifetime Member
Joined: Aug 25, 2005 Posts: 545 Location: UK
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Posted: Sun Nov 23, 2014 7:48 pm Post subject: Speed display is erratic on my 2599 |
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Anyone else seen this?
I set my cruise control on my car for 50mph. The sat nav seems to oscillate between 49 and 51 with occasional down to 48 and up to 52.
This has only started recently and it used to be dead steady at 50.
Is there anything I can do to fix this?
Alan |
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sussamb Pocket GPS Verifier
Joined: Mar 18, 2011 Posts: 4457 Location: West Sussex
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Posted: Sun Nov 23, 2014 8:50 pm Post subject: |
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Have your cruise control serviced _________________ Where there's a will ... there's a way. |
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Kremmen Pocket GPS Verifier
Joined: Mar 03, 2006 Posts: 7056 Location: Reading
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Posted: Mon Nov 24, 2014 6:20 am Post subject: |
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I've not noticed it as I don't monitor my unit that closely. Cruise control can be erratic on hills and slopes but I guess your using a flat section?
I've often wondered how SatNav speeds can be that accurate when it's assessing satellite positions that are hundreds of miles away with clouds and weather in the way.
I know car speedos are deliberately calibrated on the safe side but I still use my car one when passing cameras. _________________ Satnav:
Garmin 2599 LMT-D (Indoor test rig)
DashCam:
Viofo A119 V3
Car Average MPG :
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M8TJT The Other Tired Old Man
Joined: Apr 04, 2006 Posts: 10118 Location: Bexhill, South Sussex, UK
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Posted: Mon Nov 24, 2014 10:18 am Post subject: |
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Velocity is easy from the Doppler shift on the satellite signal. It's your position that's difficult, with triangulation on several satellites required.
As far as fixing the satnav is concerned. No. But I'm with sussamb and get your cruise control looked at if you're that concerned about the difference. |
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BigJohnD Frequent Visitor
Joined: Aug 26, 2007 Posts: 396 Location: Glannau Mersi, Lloegr
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Posted: Mon Nov 24, 2014 5:00 pm Post subject: Re: Speed display is erratic on my 2599 |
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alan_sh wrote: |
I set my cruise control on my car for 50mph. The sat nav seems to oscillate between 49 and 51 with occasional down to 48 and up to 52.
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A couple of mph either way is very common with cruise control.
Speed yo-yo-ing can be even worse on a six or seven speed auto as if the speed drops, the 'box sometimes change down and the car then accelerates away!
If your car has a speed limiter, that usually behaves better. And is good for saving fuel too. |
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alan_sh Lifetime Member
Joined: Aug 25, 2005 Posts: 545 Location: UK
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Posted: Mon Nov 24, 2014 6:24 pm Post subject: |
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The car is on a level road and the sat nav used to be very stable. I've reset it and will try again tonight on my next journey southwards. |
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