Speed display is erratic on my 2599

[alan_sh]

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

[sussamb]

Have your cruise control serviced
_________________
Where there's a will ... there's a way.

[Kremmen]

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 :

[M8TJT]

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.

[BigJohnD]

[alan_sh]

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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