You are given the postcode for the sat nav. Now how many of you remember it once it's punched into the sat nav.
You can have it stored in your mobile phone, but how does your workmate access your phone when it has a keypad code lock on it and it's you who is requiring the air ambulance. Then would you say why didn't I have it written on my head. Because this is what happened to the guy who will never work again, is going to need 24 hour 7 day a week care for the rest of his life.
How many seconds does it take to lift off your helmet compared to digging out your phone, punching in the lock code, finding your section where you stored the Fookin postcode because your mates life depends on how quick you react.
AOM your 100% correct with how the lads are. Most I know don't use roads and postcodes they are directed by cafe's and pubs.