How long does it take your Road Angel to locate sats in the morning?
03 December 2002, 11:33 AM
#1
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Mine sometimes takes up to 2miles whilst driving.
Don't have time to sit on drive way while it waits to lock on.
Am I doing something wrong or is the unit faulty?
Cheers,
Mark.
Don't have time to sit on drive way while it waits to lock on.
Am I doing something wrong or is the unit faulty?
Cheers,
Mark.
03 December 2002, 11:48 AM
#2
No = its probably OK
When you switch on a GPS unit, it needs to locate the signals from the available GPS satellites. Once it receives a signal, it doesn't know where it is, so until it can detect discernable movement against the earth compared to the sat (not vehicle movement) it does not know the sats location. It needs a minimum of 3 for a fix. That is known as a cold start & can take upto 5 mins or so.
If you go into & out of a tunnel, then it will reaquire quickly as it knows there was sats up there in certain positions, so takes a guess & is able to get a fix quickly. Sit in a tunnel (Blackwall
) for a while & it takes a bit longer to reaquire.
Rough explanation.
When you switch on a GPS unit, it needs to locate the signals from the available GPS satellites. Once it receives a signal, it doesn't know where it is, so until it can detect discernable movement against the earth compared to the sat (not vehicle movement) it does not know the sats location. It needs a minimum of 3 for a fix. That is known as a cold start & can take upto 5 mins or so.
If you go into & out of a tunnel, then it will reaquire quickly as it knows there was sats up there in certain positions, so takes a guess & is able to get a fix quickly. Sit in a tunnel (Blackwall
) for a while & it takes a bit longer to reaquire.Rough explanation.
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