GPS with no network coverage?

[Daved]

I've been trying for around a month to get the GPS work correctly on areas without network coverage but I am still running in circles.

Sometimes I get a lock in 10 seconds, sometimes in 30 seconds but most times I do not get a lock, even when the GPS picks around 8 sats.

Any tips? I really want to be able to use the GPS when there is no network coverage.

I am trying to get this done on my Titan and my Vogue.

Thanks in advance.