NAV Hack Note
07-08-06, 04:05 PM
#1
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NAV Hack Note
Hey guys,
After looking at the NAV hack and comparing it to the car's schematic, I found that the hack is bypassing the NAV's vehicle speed signal input. This signal is used by the NAV system for dead-reconing navigation. This is necessary when the GPS receiver does not have a good satelite lock and depends on the speed signal to know that the car is moving and estimate its new position until a new satelite fix is made.
With this signal now unavailable, the system is unaware of vehicle motion during times when the GPS signal is gone. So, it will miss your turn (bad luck it was when the satelites were not in range) and then mysteriously know when you got home (clear view of the sky).
It's the connection to the speed signal that differentiates an installed GPS from a dash-mounted one.
Just thought you would like to know.
After looking at the NAV hack and comparing it to the car's schematic, I found that the hack is bypassing the NAV's vehicle speed signal input. This signal is used by the NAV system for dead-reconing navigation. This is necessary when the GPS receiver does not have a good satelite lock and depends on the speed signal to know that the car is moving and estimate its new position until a new satelite fix is made.
With this signal now unavailable, the system is unaware of vehicle motion during times when the GPS signal is gone. So, it will miss your turn (bad luck it was when the satelites were not in range) and then mysteriously know when you got home (clear view of the sky).
It's the connection to the speed signal that differentiates an installed GPS from a dash-mounted one.
Just thought you would like to know.
07-08-06, 04:25 PM
#3
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Originally Posted by Airwolf
Hey guys,
After looking at the NAV hack and comparing it to the car's schematic, I found that the hack is bypassing the NAV's vehicle speed signal input. This signal is used by the NAV system for dead-reconing navigation. This is necessary when the GPS receiver does not have a good satelite lock and depends on the speed signal to know that the car is moving and estimate its new position until a new satelite fix is made.
With this signal now unavailable, the system is unaware of vehicle motion during times when the GPS signal is gone. So, it will miss your turn (bad luck it was when the satelites were not in range) and then mysteriously know when you got home (clear view of the sky).
It's the connection to the speed signal that differentiates an installed GPS from a dash-mounted one.
Just thought you would like to know.
After looking at the NAV hack and comparing it to the car's schematic, I found that the hack is bypassing the NAV's vehicle speed signal input. This signal is used by the NAV system for dead-reconing navigation. This is necessary when the GPS receiver does not have a good satelite lock and depends on the speed signal to know that the car is moving and estimate its new position until a new satelite fix is made.
With this signal now unavailable, the system is unaware of vehicle motion during times when the GPS signal is gone. So, it will miss your turn (bad luck it was when the satelites were not in range) and then mysteriously know when you got home (clear view of the sky).
It's the connection to the speed signal that differentiates an installed GPS from a dash-mounted one.
Just thought you would like to know.
Anyway, for those that have already done it (i.e. me) and those who are considering doing the hack, I would not hesitate to say that it is few and far between if this ever becomes an issue for you. The one experience I had last night corrected itself in a matter of seconds, and I would never--NEVER--trade the hacked nav for a few seconds of Nav instability once in a blue moon.
So, what I'm saying is that it really is a non-issue...that is, unless you live in an area where you have to always depend on the satellites...
07-08-06, 04:57 PM
#4
i mentioned about this long long time ago when the 2is came out, saying that you have to put a switch on the speed signal, so you can shut it off and adjust the settings (put in new addresses and so) when the car is moving, but you have to "connect" back the speed signal after you do that for the nav to operate correctly. no one believed me....
i guess here's the proof....
just run that speed signal through a switch and put the switch somewhere close to you and passenger
i guess here's the proof....
just run that speed signal through a switch and put the switch somewhere close to you and passenger
07-08-06, 05:09 PM
#5
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I recently did my hack, and I live at a condo w/ underground parking. I have no problem w/ my nav sensing the "movement" of my car when it is underground (2 level underground). I'm not sure what i did differently but my NAV still knows when my car is moving BECAUSE I STILL have to do the "NAV OVERRIDE" to input address when i'm moving. So I believe the plug J50 (PINK WIRE) is a speed sensor for the telephone / audio side of things" WHERE the WHITE/SILVER wire that is the NAV speed sensing wire. Thats you u connect PINK (from car) to white/silver (P1 adaptor). I hope this help!
Originally Posted by Airwolf
Hey guys,
After looking at the NAV hack and comparing it to the car's schematic, I found that the hack is bypassing the NAV's vehicle speed signal input. This signal is used by the NAV system for dead-reconing navigation. This is necessary when the GPS receiver does not have a good satelite lock and depends on the speed signal to know that the car is moving and estimate its new position until a new satelite fix is made.
With this signal now unavailable, the system is unaware of vehicle motion during times when the GPS signal is gone. So, it will miss your turn (bad luck it was when the satelites were not in range) and then mysteriously know when you got home (clear view of the sky).
It's the connection to the speed signal that differentiates an installed GPS from a dash-mounted one.
Just thought you would like to know.
After looking at the NAV hack and comparing it to the car's schematic, I found that the hack is bypassing the NAV's vehicle speed signal input. This signal is used by the NAV system for dead-reconing navigation. This is necessary when the GPS receiver does not have a good satelite lock and depends on the speed signal to know that the car is moving and estimate its new position until a new satelite fix is made.
With this signal now unavailable, the system is unaware of vehicle motion during times when the GPS signal is gone. So, it will miss your turn (bad luck it was when the satelites were not in range) and then mysteriously know when you got home (clear view of the sky).
It's the connection to the speed signal that differentiates an installed GPS from a dash-mounted one.
Just thought you would like to know.
07-08-06, 05:14 PM
#6
Originally Posted by Airwolf
Hey guys,
After looking at the NAV hack and comparing it to the car's schematic, I found that the hack is bypassing the NAV's vehicle speed signal input. This signal is used by the NAV system for dead-reconing navigation. This is necessary when the GPS receiver does not have a good satelite lock and depends on the speed signal to know that the car is moving and estimate its new position until a new satelite fix is made.
With this signal now unavailable, the system is unaware of vehicle motion during times when the GPS signal is gone. So, it will miss your turn (bad luck it was when the satelites were not in range) and then mysteriously know when you got home (clear view of the sky).
It's the connection to the speed signal that differentiates an installed GPS from a dash-mounted one.
Just thought you would like to know.
After looking at the NAV hack and comparing it to the car's schematic, I found that the hack is bypassing the NAV's vehicle speed signal input. This signal is used by the NAV system for dead-reconing navigation. This is necessary when the GPS receiver does not have a good satelite lock and depends on the speed signal to know that the car is moving and estimate its new position until a new satelite fix is made.
With this signal now unavailable, the system is unaware of vehicle motion during times when the GPS signal is gone. So, it will miss your turn (bad luck it was when the satelites were not in range) and then mysteriously know when you got home (clear view of the sky).
It's the connection to the speed signal that differentiates an installed GPS from a dash-mounted one.
Just thought you would like to know.
You must not have read on about the NAV hack, although you do in fact clip the pink wire from the "multi display" you DO reconnect the speed signal to the white, silver banded wire BACK INTO the NAV computer so that it does in fact have the dead reckoning available to it, so no there is no problem when you have a diminished GPS signal
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07-08-06, 06:18 PM
#8
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Originally Posted by Airwolf
The reconnect (white wire) feeds the stereo for speed-sensitve volume. I could be wrong.
07-08-06, 07:04 PM
#9
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Originally Posted by SuperLexy
Hmmm...yes, this makes sense. In fact, I think I had it happen to me last night for a second...I thought I had the "jumpy nav" problem, but then realized it was a one-off. Did not happen again.
Anyway, for those that have already done it (i.e. me) and those who are considering doing the hack, I would not hesitate to say that it is few and far between if this ever becomes an issue for you. The one experience I had last night corrected itself in a matter of seconds, and I would never--NEVER--trade the hacked nav for a few seconds of Nav instability once in a blue moon.
So, what I'm saying is that it really is a non-issue...that is, unless you live in an area where you have to always depend on the satellites...
Anyway, for those that have already done it (i.e. me) and those who are considering doing the hack, I would not hesitate to say that it is few and far between if this ever becomes an issue for you. The one experience I had last night corrected itself in a matter of seconds, and I would never--NEVER--trade the hacked nav for a few seconds of Nav instability once in a blue moon.
So, what I'm saying is that it really is a non-issue...that is, unless you live in an area where you have to always depend on the satellites...
Last edited by Style2k6; 07-08-06 at 07:22 PM.
07-08-06, 08:36 PM
#10
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Originally Posted by Style2k6
My thought's are why would you need to use the nav in an area you live? I think it would be more for use in an area or cities you are not familiar with and then the issue of cityscape tall buildings etc would force the system to use the speed to calculate location. Also what about bad weather conditions?
07-08-06, 08:52 PM
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Originally Posted by muzzman1
Incorrect,
You must not have read on about the NAV hack, although you do in fact clip the pink wire from the "multi display" you DO reconnect the speed signal to the white, silver banded wire BACK INTO the NAV computer so that it does in fact have the dead reckoning available to it, so no there is no problem when you have a diminished GPS signal
You must not have read on about the NAV hack, although you do in fact clip the pink wire from the "multi display" you DO reconnect the speed signal to the white, silver banded wire BACK INTO the NAV computer so that it does in fact have the dead reckoning available to it, so no there is no problem when you have a diminished GPS signal
Again, it's really a non-issue for me, but I was just trying to determine if it's the system overall, or a result of the hack...
07-08-06, 08:56 PM
#12
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Originally Posted by Style2k6
My thought's are why would you need to use the nav in an area you live? I think it would be more for use in an area or cities you are not familiar with and then the issue of cityscape tall buildings etc would force the system to use the speed to calculate location. Also what about bad weather conditions?
That said, even though I knew where my home was, when I bought my Acura MDX a few years ago, the nav didn't acknowledge my neighborhood since it was relatively new. It was annoying...
07-08-06, 10:43 PM
#13
I have had my nav hacked since a week after I got my car in March.
Here I am 10,000 miles later (computer tech/consultant) and I have never had a problem with the navigation.
Follow the instructions very carefully. If you have installed a car stereo before then this "should" be a cake walk.
Here I am 10,000 miles later (computer tech/consultant) and I have never had a problem with the navigation.
Follow the instructions very carefully. If you have installed a car stereo before then this "should" be a cake walk.
07-08-06, 11:01 PM
#14
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The signal is bypassed from the multi-display only. When the NAV Hack is performed, you are connecting the vehicle speed sensor directly to the NAV unit (the unit housing the NAV DVD).
I have no problems with jumpy NAV, and I have never missed a turn because of it. (I am running the navigation hack).
-Brian
I have no problems with jumpy NAV, and I have never missed a turn because of it. (I am running the navigation hack).
-Brian
07-09-06, 07:34 AM
#15
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I do not know if that is the reason or not, but my Nav shows the car positions off from the road. 
What I mean is positions of car is running along next to road instead of on top of the road.
It starts at begaining of drive off and lasts from a few seconds to 15 seconds or so. Then everything is O.K.
I can deal with this, if it does not get any worse. It will bother me greatly if it lasts more than a few minutes but a few seconds, I can deal with it.
What I mean is positions of car is running along next to road instead of on top of the road.
It starts at begaining of drive off and lasts from a few seconds to 15 seconds or so. Then everything is O.K.
I can deal with this, if it does not get any worse. It will bother me greatly if it lasts more than a few minutes but a few seconds, I can deal with it.