Dead reckoning...on Nuvi 360? Am I dreaming?
Mon, 08/25/2008 - 2:58pm
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16 years
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Am I dreaming or what? Last weekend I went north on 95 thru Baltimore tunnel I did not get the poor signal when I am in the tunnel but the vehicle indication on GPS still showed still moving as if it got signal. On the way back when I am in the tunnel I press to view map and look at the signal strength and it showed nothing meaning no sattelites reception at all but the vehicle on the map still showing if it got the sattelite signal. Did Garmin quietly do this on one of their updates? I remembered last time when I go thru the tunnel it lost the sattelite then pop up poor signal strength and the vehicle stop moving.
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I noticed the same thing in Boston last week. It actually did'nt dawn on me till we came out of the tunnel.
******************Garmin Nüvi 1300T****************Member 6523*******************
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The units are "faking it". They are extrapolating your position based upon the speed and direction at which you entered the tunnel.
If you look at the speed, you will notice that it doesn't change when you are in the tunnel despite your actual speed. Also, if your unit shows the elevation, you will notice that it continues to go down even once you start coming back up.
thats what dead reckoning is
thats what dead reckoning is
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Yeah, but it's really not calculating anything ... it's just advancing the cursor along the map. And if it doesn't regain the signal after a prescribed period of time, you will be the "Lost satellite" message.
Do any garmin units do dead
Do any garmin units do dead reckoning? My friend always raves about how the BMW built-in ones have gyros and hook into the speedometer. He says he can drive for about a week with the GPS antenna unplugged before it gets a block off.
It did not do that last year when I first got the GPS...
Yeah, but it's really not calculating anything ... it's just advancing the cursor along the map. And if it doesn't regain the signal after a prescribed period of time, you will be the "Lost satellite" message.
So they did something on the updates but did not tell us though.
Update
Is there a list from Garmin that shows what the updates do?
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http://www8.garmin.com/support/blosp.jsp
Click on the firmware you want. Then click on Download under Unit Software. Then agree to the EULA. Then you can look at the update history.
Dead Reckoning
Do any garmin units do dead reckoning? My friend always raves about how the BMW built-in ones have gyros and hook into the speedometer. He says he can drive for about a week with the GPS antenna unplugged before it gets a block off.
The Garmin StreetPilot 7500 ( which is now discontinued ) was the last one that I know of that had Dead Reckoning.
To my knowledge, none of the current Garmin model have it.
Tim