You're very fortunate to get an instruction book. Both the sat nag and the dash cam came with no instructions at all. It is assumed that you know exactly what to do with them or presumably you can search the internet for instructions. We asked a tech savvy 26 year old.

Sat nag, I like that, she does go on sometimes.
Dave

She's a pain in the proverbial sometimes. Her worst, you take the route she indicates, make the turn and then she says "There is a better route available". Well if there is a better route why did she send me down the other one?