GPS as a backup / start-up times etc.

[Wal]

Bit of a newbie at this, but hope you can help - I’d like to take a GPS with me on my trip, but mainly for backup, not general navigation – I’d like to be able to pack it away and only turn it on occasionally to confirm where I am. .

The questions I have are:

1) If I were to pack my GPS away for a few days, and then fire it up, would it take a long time to get an accurate fix? - i.e. would that be equivalent to a cold start-up – Time to First Fix (TFF) I think the term is?

2) Does it store information on the last location it was used, and use that as a short-cut to guess where to start looking for satellites?

3) If so, how does it know how much time has passed since it was turned on - does it have an internal clock of some sort that it maintains even when it’s turned off (like a PC), and does that mean that sooner or later there is an internal battery to replace?

Any advice you can give would be much appreciated.

Thanks … Wal