Nav allignment

CrazyRussian · 08-01-2006, 04:46 PM

Guys,

has anyone encountered NAV system lose allignment? I've noticed a few times that when I am in "head on" mode (the one with the car icon always pointing up and the map rotating as you drive) the NAV system "thought" that I was going off road. It did that for a few seconds and then adjusted to allign the road with the car icon. I remember reading in the manual about NAV calibration, has anyone done it?

Any input is appreciated.

Thank you,

CR

aaf709 · 08-01-2006, 04:56 PM

Every once in a while. It pops back after a few seconds.

qbee42 · 08-01-2006, 10:25 PM

Yes. If the GPS looses its lock, the NAV system dead reckons. When this happens, your position and heading will drift off a bit. Once the GPS gets a good fix, then the NAV re-aligns.

Tom

DanMan32 · 08-02-2006, 01:51 PM

Even with GPS lock, NAV actually runs on ded reconing with GPS verification. It also looks at the map and if a road is nearby from where the NAV placed you, and it appears as if you are following the road, NAV will adjust and snap you onto the road.

That's why my driveway appears to be the nearby cross-street as my driveway is only about 100 feet and parallel to the cross-street.
And because of this 'adjustment', when I leave my house, my possition is skewed by about 100 or so feet until I make a turn, then it realizes I turned at a nearby intersection (nearby from NAV's perspective) and re-adjusts accordingly.

So, it uses ded-reconing, GPS, and map info to track your position.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Los Angeles Area owners, good service (allignment)?	jig	Gen II Prius Care, Maintenance and Troubleshooting	6	07-16-2007 02:17 PM

08-01-2006, 04:46 PM	#1
CrazyRussian Join Date: Apr 2006 Posts: 42 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Guys, has anyone encountered NAV system lose allignment? I've noticed a few times that when I am in "head on" mode (the one with the car icon always pointing up and the map rotating as you drive) the NAV system "thought" that I was going off road. It did that for a few seconds and then adjusted to allign the road with the car icon. I remember reading in the manual about NAV calibration, has anyone done it? Any input is appreciated. Thank you, CR

08-01-2006, 04:56 PM	#2
aaf709 Ravenpaw of ThunderClan Join Date: Apr 2005 Location: San Diego, CA Posts: 3,839 My Car: 2005 Prius Model: Package: #6 Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Every once in a while. It pops back after a few seconds.

08-01-2006, 10:25 PM	#3
qbee42 Senior Member Join Date: Mar 2006 Location: Northern Michigan Posts: 10,477 My Car: 2006 Prius Model: Package: #7 Thanks: 95 Thanked 391 Times in 290 Posts Friends: 10	Yes. If the GPS looses its lock, the NAV system dead reckons. When this happens, your position and heading will drift off a bit. Once the GPS gets a good fix, then the NAV re-aligns. Tom

08-02-2006, 01:51 PM	#4
DanMan32 Join Date: Aug 2004 Location: Tampa Bay, FL Posts: 3,775 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Even with GPS lock, NAV actually runs on ded reconing with GPS verification. It also looks at the map and if a road is nearby from where the NAV placed you, and it appears as if you are following the road, NAV will adjust and snap you onto the road. That's why my driveway appears to be the nearby cross-street as my driveway is only about 100 feet and parallel to the cross-street. And because of this 'adjustment', when I leave my house, my possition is skewed by about 100 or so feet until I make a turn, then it realizes I turned at a nearby intersection (nearby from NAV's perspective) and re-adjusts accordingly. So, it uses ded-reconing, GPS, and map info to track your position.