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Using SAT Nav in London

 
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SuprUsr
Occasional Visitor


Joined: Dec 31, 2005
Posts: 1

PostPosted: Sat Dec 31, 2005 8:49 pm    Post subject: Using SAT Nav in London Reply with quote

Hi all

Has anyone used this BT77 GPS in London? My experience with this is it's not very good. The problems I have been getting is TT5 would 'spin' as if I have changed direction. It was suggested to me that I should turn off the 3D mode and use 2D instead but this doesn't make difference. It would also sometimes while in a typical London traffic it would report that I am in a different road all of a sudden even though that I am stationary. Despite this main problem driving in London, it would direct me to my final destination...eventually. However, while outside the City, it works a treat and I have no complaints. My conclusion to the problem operating in London are the tall buildings that's preventing the GPS to get a good satellite fix.

Does anyone else share this same problem?

Many thanks
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mikealder
Pocket GPS Moderator
Pocket GPS Moderator


Joined: Jan 14, 2005
Posts: 19638
Location: Blackpool , Lancs

PostPosted: Sat Dec 31, 2005 10:11 pm    Post subject: Reply with quote

Welcome to the forum, Your conclusion answers your own question the BT77 is a decent unit but confined within tall buildings it will struggle to achieve a steady lock. The "jumping" about and "spinning" of the display is usually due to the loss or lack of a sat signal. Once the signal is re-aquired the software will take you to the destination, keep an eye on the signal strength meter (bottom RH) and see if that gives a prior indication to the spinning (i.e. it drops to no bars).
If the vehicle has thermal glass consider an external GPS or re-rad unit to boost the signal in the car, or a sirfIII equipped GPS unit as these have a far greater sensitivity, but can, at times still struggle in heavily built up areas - Mike
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buphone
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Joined: Aug 01, 2005
Posts: 36

PostPosted: Tue Jan 03, 2006 12:50 pm    Post subject: Reply with quote

Quote:
It was suggested to me that I should turn off the 3D mode and use 2D instead but this doesn't make difference.


As you found out, the display mode has no effect on knowledge of position.

Everybody gets the symptoms that you get. There is a 'Show GPS status' menu option. It shows you how many satellites are in view and their signal strength.
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metroace
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Joined: Sep 27, 2005
Posts: 169
Location: Middlesex

PostPosted: Tue Jan 24, 2006 8:41 pm    Post subject: Reply with quote

This problem of a spinning display and losing satellite fixes is common across platforms when operating in London. Probably the same elswhere when driving in conditions similar to deep and narrow ravines.
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