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spook51
Lifetime Member
Joined: Mar 26, 2004
Posts: 548
Location: East Midlands
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 Posted: Sun Nov 06, 2011 3:49 pm Post subject: |
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I drove from Rochester via Watford and Kenilworth to Chesterfield yesterday afternoon. Going throough the Dartford Tunnel my 940 retained satellite connection right the way through (it hasn't done that before as far as I can remember) and also Traffic showed the 'countdown' to the next incident right the way through i.e. 2.9, 2.8, 2.7 miles etc.
Better still, it didn't lose Traffic at all, not once, during the entire journey - a great improvement for which I am very grateful. |
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Darren
Frequent Visitor
Joined: 11/07/2002 14:36:40
Posts: 23848
Location: Hampshire, UK
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| Posted: Sun Nov 06, 2011 4:49 pm Post subject: |
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| spook51 wrote: | | I drove from Rochester via Watford and Kenilworth to Chesterfield yesterday afternoon. Going throough the Dartford Tunnel my 940 retained satellite connection right the way through (it hasn't done that before as far as I can remember) and also Traffic showed the 'countdown' to the next incident right the way through i.e. 2.9, 2.8, 2.7 miles etc. |
That's due to the EPT (Enhanced Positioning Technology) which is a solid state gyro sensor, fitted in the 940. That allows it to continue to estimate speed when you lose signal such as in a tunnel.
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Darren Griffin |
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M8TJT
The Other Tired Old Man
Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK
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| Posted: Sun Nov 06, 2011 4:50 pm Post subject: |
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| spook51 wrote: | | Going throough the Dartford Tunnel my 940 retained satellite connection right the way through |
 They must be re-radiating the sats then |
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spook51
Lifetime Member
Joined: Mar 26, 2004
Posts: 548
Location: East Midlands
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| Posted: Sun Nov 06, 2011 6:55 pm Post subject: |
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| Darren wrote: | | spook51 wrote: | | I drove from Rochester via Watford and Kenilworth to Chesterfield yesterday afternoon. Going through the Dartford Tunnel my 940 retained satellite connection right the way through (it hasn't done that before as far as I can remember) and also Traffic showed the 'countdown' to the next incident right the way through i.e. 2.9, 2.8, 2.7 miles etc. |
That's due to the EPT (Enhanced Positioning Technology) which is a solid state gyro sensor, fitted in the 940. That allows it to continue to estimate speed when you lose signal such as in a tunnel. |
Thanks for the explanation however it's never done it before. Whatever the reason, after emerging from the tunnel my 940 now continues to show Traffic info. |
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spook51
Lifetime Member
Joined: Mar 26, 2004
Posts: 548
Location: East Midlands
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| Posted: Sun Nov 06, 2011 6:59 pm Post subject: |
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| M8TJT wrote: | | spook51 wrote: | | Going throough the Dartford Tunnel my 940 retained satellite connection right the way through |
They must be re-radiating the sats then |
I know what I meant....  |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Sun Nov 06, 2011 8:27 pm Post subject: |
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If EPT is in operation, you should see a little icon in the bottom left of the screen. There's a picture of it on page 15 of the quick user manual).
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Darren
Frequent Visitor
Joined: 11/07/2002 14:36:40
Posts: 23848
Location: Hampshire, UK
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| Posted: Sun Nov 06, 2011 8:53 pm Post subject: |
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Whilst I can ses them installing dedicated GSM antennas, or more simply leaky feeders in the tunnel, it'd be nigh on impossible to install a GPS Re-radiator system. Any system could only report the position of its single outside antenna.
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Darren Griffin |
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spook51
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Joined: Mar 26, 2004
Posts: 548
Location: East Midlands
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| Posted: Sun Nov 06, 2011 8:57 pm Post subject: |
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| Can't say I noticed Andy but it's a 400 mile round trip to check so I think I'll wait until I'm next due that way. |
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