Hot start?

Countryman · Posted: Mon Mar 19, 2007 3:30 am Post subject: Hot start?

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!

philpugh · Posted: Mon Mar 19, 2007 12:00 pm Post subject:

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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Phil

Countryman · Posted: Mon Mar 19, 2007 2:52 pm Post subject:

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?

Cheers!

philpugh · Posted: Mon Mar 19, 2007 6:47 pm Post subject:

Sorry - can't help you there.
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Phil

philpugh · Posted: Tue Mar 20, 2007 10:10 am Post subject:

...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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Phil

Countryman · Posted: Fri Mar 23, 2007 1:22 am Post subject:

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

robertn · Frequent Visitor Joined: Feb 06, 2005 Posts: 564

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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