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.

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 :rolleyes: ) for a while & it takes a bit longer to reaquire.

Rough explanation.