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Nav strange behaviour

raynewman

Active Member
Oct 11, 2014
1,509
512
Brisbane, Australia
While driving along a straight 2 km stretch of suburban road in Brisbane today, the little red arrow car icon just went in circles in one place - most strange.

[video]https://plus.google.com/u/0/107631671374825180371/posts/Q1kzZ5sSA5x?pid=6203916089714563154&oid=107631671374825180371[/video]
 

fwgmills

Supporting Member
Jun 30, 2015
151
70
Roanoke, TX
I don't know how tall the buildings on that street are, but all GPS has trouble on streets with tall buildings because the car can only see satellites directly above you and may not be able to lock 3 satellites (required for an accurate fix). I get this effect sometimes driving the streets in downtown Dallas, TX because of building height blocking satellites.
 

raynewman

Active Member
Oct 11, 2014
1,509
512
Brisbane, Australia
I don't know how tall the buildings on that street are, but all GPS has trouble on streets with tall buildings because the car can only see satellites directly above you and may not be able to lock 3 satellites (required for an accurate fix). I get this effect sometimes driving the streets in downtown Dallas, TX because of building height blocking satellites.
That shouldn't be a problem. The street is quite open in places and I travel it regularly without a problem.
 

Trav

Member
Apr 14, 2015
112
1
Perth Western Australia
While driving along a straight 2 km stretch of suburban road in Brisbane today, the little red arrow car icon just went in circles in one place - most strange.

[video]https://plus.google.com/u/0/107631671374825180371/posts/Q1kzZ5sSA5x?pid=6203916089714563154&oid=107631671374825180371[/video]

My nav did the same thing at about 3pm WST.

maybe it was a problem with the satellite...
 

WhiteStar

Member
Sep 28, 2014
534
117
Sydney, AU
Unless Ray really did do doughnuts at a B&S Ball in the Valley, I think our friend from Dallas has provided the most likely accurate answer. Typically a minimum of three satellite fixes are required for triangulating a roughly accurate location although much greater accuracy is achieved with more satellite fixes. As stated, buildings, trees even clouds can obscure a fix so most likely that the dancing icon occurs when there’s less than 3 satellite fixes at any given time.
 

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