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Hot start?

 
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Countryman
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Joined: Mar 20, 2004
Posts: 40
Location: South of France

PostPosted: Mon Mar 19, 2007 3:30 am    Post subject: Hot start? Reply with quote

I'm almost too embarrassed to ask this one. Embarassed I have just downloaded GPSViewer to try to debug a problem with my TomTom BT GPS. I notice that there are check boxes for Cold, Warm and Hot Start. What is this all about then?

Cheers!
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philpugh
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Joined: Dec 28, 2005
Posts: 2003
Location: Antrobus, Cheshire

PostPosted: Mon Mar 19, 2007 12:00 pm    Post subject: Reply with quote

These terms are generally used to evaluate the time taken from turning on the GPS until it gets a 'lock' on position from the sats. I don't know if there are any definitions as such but..

Hot start - would imply that the GPS receiver has just been turned off and then back on again. It usually refers to a few 10's of seconds of being off (e.g. battery change). It is assumed that the unit has not been moved whilst off.

Warm start - like above but off for longer (10's of mins - up to a couple of hours). Assumed that unit has not been moved (e.g. parked car, gone away, come back and turned GPS back on).

Cold Start - off for several hours / days or moved position a long way since last being used. (e.g. taken unit on holiday flight whilst off or not used over a weekend).


Hope this helps.
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Countryman
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Joined: Mar 20, 2004
Posts: 40
Location: South of France

PostPosted: Mon Mar 19, 2007 2:52 pm    Post subject: Reply with quote

Many thanks Phil. But do you know what the functions of the Hot, Warm and Cold 'radio buttons' on the GPSViewer display are for? Do they simulate the three start-up conditions?

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philpugh
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Joined: Dec 28, 2005
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Location: Antrobus, Cheshire

PostPosted: Mon Mar 19, 2007 6:47 pm    Post subject: Reply with quote

Sorry - can't help you there.
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philpugh
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Joined: Dec 28, 2005
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Location: Antrobus, Cheshire

PostPosted: Tue Mar 20, 2007 10:10 am    Post subject: Reply with quote

...But I had a look at a manual for a HOLUX GPS and it had this bit of info in it. (I paraphrase for simplicity)

HOT Start: Restart the GPS using it's internally stored data.

WARM Start (No Init): As HOT start but clears ephemeris data only.

WARM Start (Init): This option clears everything then loads a user-defined set of data and restarts GPS

COLD Start: Clears all data and restarts GPS

The manual was the SiRF Demo manual on this page http://www.holux-uk.com/Products/cr-100/download.shtml

If the GPSViewer which is available on the same page is the one you are using I would suggest that the WARM start it has is the same as the WARM Start (no init) above. So your supposition is correct - it simulates startup in the three conditions.
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Countryman
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Joined: Mar 20, 2004
Posts: 40
Location: South of France

PostPosted: Fri Mar 23, 2007 1:22 am    Post subject: Reply with quote

Phil,

Many thanks for taking the time to reply! I also see that you are a Memory Map user. I have Bayo and was considering a move to MM so I sent them two emails with pre-sales questions. They couldn't be bothered to reply so I won't be spending my hard earned with that shower!

Brian
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robertn
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Joined: Feb 06, 2005
Posts: 564

PostPosted: Fri Mar 23, 2007 3:18 am    Post subject: Reply with quote

Memory map is an awesum product. I would not use anything else for off-road stuff. I have never had a need to contact them though so can't report on their service.
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