The Nuvi 755T

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ravindara82
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Re: The Nuvi 755T

#61 Post by ravindara82 » Tue Feb 17, 2009 12:46 pm

my hp is Sony Ericsson W902, my GPSr is 205W.
All of the tunnel my hp still can use.

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Re: The Nuvi 755T

#62 Post by mnd_43 » Tue Feb 17, 2009 1:23 pm

ravindara82 wrote:my hp is Sony Ericsson W902, my GPSr is 205W.
All of the tunnel my hp still can use.
Where are your location ?
If near KL just try SMART TUNNEL ....

:D
:D ... de 9W2BPN

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Re: The Nuvi 755T

#63 Post by amrirahman » Tue Feb 17, 2009 1:30 pm

normal phones get signals from base stations close by, sat phones & gps get theirs from way up in the sky. different technologies at work. then you have nokia's a-gps, again, a bit different.

hope garmin gets it act together. after all, as mentioned by bro tks, tom-tom can do it...

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Re: The Nuvi 755T

#64 Post by tks » Tue Feb 17, 2009 6:32 pm

ravindara82 wrote:my hp is Sony Ericsson W902, my GPSr is 205W.
All of the tunnel my hp still can use.
question is not whether your hp can use but whether your GPSr CAN USE IN TUNNEL!


hp and GPSr are two different devices

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Re: The Nuvi 755T

#65 Post by Tom2 » Wed Feb 18, 2009 8:36 am

Agreed with tks. You should lose the signal when you enter a tunnel unless is a very shot distance. Even my TomTom lost the signal but the projection program calculate your last car speed and using those info to project the icon in the GPS map. This also happen very often in area where you have many tall buildings and blocking the signal from reaching the GPS.

One good thing about 755T is the reception signal is stronger. When I travel in New York, it still lost the bearing sometimes. However, it will pick up again the signal pretty fast.

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Re: The Nuvi 755T

#66 Post by tks » Wed Feb 18, 2009 3:21 pm

Hi Tom2 (hey, any connection with TomTom?),

Where did you get the phrase "tunnel projection"? I searched TomTom website everywhere and cannot find any explanation of this feature. Just a short video that shows nothing. Only thing I found is in a 2005 TomTom IPO Prospectus:
Positioning Technology

Our products utilise GPS-related positioning technology and position
augmentation technologies that require no data input from the vehicle, such as vehicle speed or a
gyroscope reading. We combine common augmentation techniques such as map-matching and
dead-reckoning in all our products which have our ASN technology, namely the original TomTom
GO and the TomTom GO 500 and 700 products. Our ASN technology can track vehicle turns and
uses the pre-planned route to estimate current position during GPS signal interruption.

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Re: The Nuvi 755T

#67 Post by SilverBeauty » Wed Feb 18, 2009 8:30 pm

Believe the correct terminology should be predictive tracking based on your speed and last known position. ...

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Re: The Nuvi 755T

#68 Post by jerome » Wed Feb 18, 2009 10:26 pm

SilverBeauty wrote:Believe the correct terminology should be predictive tracking based on your speed and last known position. ...
the term is dead reckoning

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Re: The Nuvi 755T

#69 Post by SilverBeauty » Thu Feb 19, 2009 8:46 am

Thanks for the correction of the terminology =D>

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Re: The Nuvi 755T

#70 Post by tks » Thu Feb 19, 2009 9:36 am

I wonder why Garmin chooses not to implement this feature (dead reckoning, predictive tracking, map matching or tunnel projection) in their Nuvis. This feature will become more useful with more tunnels and more places of GPS satellite interruption. Is it because of some TomTom IP Protection? I read from some of TomTom's adverts that they are touting this feature.

I also read complaints from some TomTom users that this dead reckoning in tunnels works only for a few km. After that, the device goes dead. The users want it to last longer. Now I recall that even with Garmin Nuvis, the device does continue to work but for a very very short time when you enter the tunnel. Did not some of the experts here were trying to figure out a way to lengthen this time when the Nuvi is doing some sort of dead reckoning/predictive tracking? If this can be done, then we can have the similar feature in our Nuvi!

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