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Future Vehicles 2008 Subaru Impreza WRX
1480 messages, Last post on Jul 06, 2009 at 4:52 PM
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Replying to: rsholland (Sep 19, 2007 7:54 am) I have an older model. It can take a little while to obtain the signal the first time. I don't have a problem with losing a signal once I get going though. Besides a tunnel, I also lose signal in a covered garage, but again, I'm not relying on the GPS at that time.
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Replying to: ateixeira (Sep 19, 2007 8:03 am) "Self-contained navigation is a system that detects the vehicle's position by calculating the vehicle's driven distance and turning angle th(r)ough the use of various types of sensors that are mounted on the vehicle." So the direction is detected by driving with the wheels turned as well and it works in the underground parking lots!  Of course not that you would need that, but there are underground parking lots where you could get lost and as people stated - you can lose the signal anywhere. If not for these anyway the positioning would not be so detailed and smooth - the GPS I have with my MapPoint tends to teleport me from place to place where the visibility is limited giving the annoying "off route" warnings... I wonder what would it look like if I started drifting in that underground parking... 
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Replying to: xyzzer (Sep 18, 2007 11:06 pm)  Hey, thanks for posting up your answers... good to read you're so satisfied w/your new WRX. From your videos, it looks like you had a lot of fun w/your Outback Sport, so this should be a real blast. 
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Replying to: xyzzer (Sep 19, 2007 8:20 am)
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Replying to: ateixeira (Sep 19, 2007 10:02 am) -mike
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Replying to: paisan (Sep 19, 2007 6:06 pm) I'm assuming the heaviest satellite coverage is over the heaviest population areas, and I've read that coverage ranges from 8 satellites in continuous line of sight in some latitudal zones, to 5 in others. You need 4 satellites for accurate GPS tracking, so in some zones there's not as much backup coverage if something's blocking line of sight.
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Replying to: rsholland (Sep 19, 2007 7:28 am) How can it work without a satellite? The term is dead reckoning, and it uses your last known position and the sensors mentioned (speed, heading, pitch/yaw or steering wheel angle) to determine position. The algorithm is designed to switch back and forth as it needs to - satellites are preferred but dead reckoning can work intermittently as necessary as well. Its pretty amazing how far these have come. When we were doing interface evaluation on the Magellan 750 Nav (better known as "Hertz Neverlost" there were limited connections to vehicle information. Now some handheld models include position sensors for dead reckoning: Garmin StreetPilot 7500 |
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Replying to: paisan (Sep 19, 2007 6:06 pm) I have the older C series models, the newer ones have SIRF technology and quicker/better reception. I'm sure that helps. It's never really been a problem, just some times it can take a minute to establish the original signal when I power it on. |
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Replying to: rsholland (Sep 19, 2007 7:36 am) The Garmin type systems (I have a Garmin 660 with the newer Sirf Star III chip) does not do as well in such situations. My point of comparison is with my Garmin and my Honda Odyssey's built-in NAV. Garmin does have a model with dead reckoning (one of their 7-series model ??) but then that has to be professionally installed into the car's controls and I assume you lose some of the portability. |
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We recently did a 2200 mile trip from MN to TX and back in the WRX, using the Garmin 660 portable NAV. On the way to Dallas, after a while, it took us through a weird set of back country roads, when the whole 1000 mile distance could be covered by just sticking to I-35S. I was disappointed in the NAV engine, since the Odyssey's system would never have done that. On the way back, it tried to do the same but I deliberately ignored the direction to take the back-road hwy route and stuck to I-35N, and from then on, the Garmin then re-directed through I-35N. That was certainly weird, especially since it was set at "Fastest time". In other words, if I did not know about the I-35N situation and relied on the NAV's direction, it would have given me a guided tour of all the backroads from Dallas to MN. Also, unlike other sophisticated NAV engines, there is no option to avoid a certain road/hwy, unless you "detour" once the trip is underway or deliberately ignore the NAV's direction (as I did). You will have to stick to whatever the NAV engine comes up with....I think this is a serious shortcoming in the Garmin 660.
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