Check the speed of this!
- Thread starter shedracer
- Start date
PanEuropean
Registered user
Check out this link: NPR - motorcycle 145 MPH over the speed limit...
One of the Garmin engineers sent the above URL to me today - along with a note hoping that I was not in Minnesota recently. I accumulated so many speeding tickets testing the 26xx last summer in North America I shipped the bike to Europe (one way) - cheaper to pay the air freight than the tickets.
PanEuropean
One of the Garmin engineers sent the above URL to me today - along with a note hoping that I was not in Minnesota recently. I accumulated so many speeding tickets testing the 26xx last summer in North America I shipped the bike to Europe (one way) - cheaper to pay the air freight than the tickets.
PanEuropean
Howard Millichap
Registered user
shedracer said:Just been for a spin, didn`t realise my bike was so quick!!!!!!!!!
This is interesting because my SP3 is showing a max speed of 545mph but I haven't taken it onto any aircraft or anything like that BUT.....it did loose satelite signal through a loooooong tunnel in the Alps. I wonder if it calculated a speed from the time it lost signal to the time it reaquired it over the distance it then realises it has travelled sort of thing??
Answers on a postcard...........
PanEuropean
Registered user
These little glitches (impossible speed readouts) happen when the GPSR just barely picks up enough satellites to plot a location, but the geometry of the satellites it has picked up is poor. Then, if it suddenly picks up several more satellites, and establishes good geometry, it assumes you have moved very quickly, because satellite reception was not "lost" entirely.
Howard's comment about encountering this problem coming out of a tunnel in the Alps is a perfect example. Probably what happened was as follows: The last 300 yards of the tunnel was a snowshed or similar, so the GPSR had 3 satellites - the absolute minimum to establish a 2 dimensional fix - then he rode out of the snowshed, and the GPSR picked up another 5 or 6 satellites all at once, and "corrected' the position of the vehicle.
The software engineers could eliminate this by introducing more stringent requirements for satellite geometry before accepting the information and using it to establish a position, but the drawback of doing this would be that once you lost reception, it would take much longer for the GPSR to be satisfied with the integrity of the (re-acquired) satellite reception. Because the only unwanted side-effect of this rare 'bad geometry' problem is a really high speed for half a second or so, the engineers decided not to trade off speed of re-acquisition (which is needed every time you pass under a tree or in front of a tall building) in favour of higher standards of precision (which would only be needed coming out of snowsheds and tunnels).
It is interesting to note that recently in America - where else but?
- a court tossed out a GPS record as evidence in a criminal case because there was one track record, 2 seconds long, showing an improbable speed. It was not a Garmin GPSR, though.
PanEuropean
Howard's comment about encountering this problem coming out of a tunnel in the Alps is a perfect example. Probably what happened was as follows: The last 300 yards of the tunnel was a snowshed or similar, so the GPSR had 3 satellites - the absolute minimum to establish a 2 dimensional fix - then he rode out of the snowshed, and the GPSR picked up another 5 or 6 satellites all at once, and "corrected' the position of the vehicle.
The software engineers could eliminate this by introducing more stringent requirements for satellite geometry before accepting the information and using it to establish a position, but the drawback of doing this would be that once you lost reception, it would take much longer for the GPSR to be satisfied with the integrity of the (re-acquired) satellite reception. Because the only unwanted side-effect of this rare 'bad geometry' problem is a really high speed for half a second or so, the engineers decided not to trade off speed of re-acquisition (which is needed every time you pass under a tree or in front of a tall building) in favour of higher standards of precision (which would only be needed coming out of snowsheds and tunnels).
It is interesting to note that recently in America - where else but?
- a court tossed out a GPS record as evidence in a criminal case because there was one track record, 2 seconds long, showing an improbable speed. It was not a Garmin GPSR, though.PanEuropean
Turn-off the max speed indicator?
A mate has just acquired an SPIII and has asked if it's possible to turn-off the maximum speed indication? Not just clear it down to zero, but turn it off so that it never records a maximum speed. I think he's worried about it being interrogated before he has a chance to clear it down...
I've done a search but can't find the answer on here. Any thoughts?
Ta muchly,
Penf
A mate has just acquired an SPIII and has asked if it's possible to turn-off the maximum speed indication? Not just clear it down to zero, but turn it off so that it never records a maximum speed. I think he's worried about it being interrogated before he has a chance to clear it down...
I've done a search but can't find the answer on here. Any thoughts?
Ta muchly,
Penf
Not got a pic of it but i updated the software on my 276c to v4 and had some funny things happening...I not only got silly high speeds but also silly milage figures and average speed figures...When in a city the unit was loosing reception then for some reason locking on for a split second hundreds of miles from the correct location when it locked back on the the correct location it added the error in to the trip computer and came up with silly figures like 1100 miles average speed...It did not do this last time i used it before the update..I have now got v4.1 but not had chance to test it out yet...Has anyone else had this problem ?
mrTickle
Registered user
I had the same problem with my 2610 when I updated it about 6 months ago - very high top speed readings, being -50 meters under sea level 
and it kept thinking I was off route when I wasn't.
I've recently loaded the latest firmware for it and not experienced any problems with it since. If there's newer firmware out for yours, maybe it's worth reflashing again?
and it kept thinking I was off route when I wasn't.I've recently loaded the latest firmware for it and not experienced any problems with it since. If there's newer firmware out for yours, maybe it's worth reflashing again?
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