Before the Journey · Principle 1 of Six
Make sure you have the correct destination.
Before a route can be planned, the destination has to be the right one. A postcode covers an area rather than a single door, a street name is repeated in dozens of towns, and a business may still be listed at an address it left years ago.
Confirming the destination means checking that the place the satnav has accepted is the place you actually mean to arrive at — and, where it matters, which entrance of it.
Every principle that follows depends on this one. A route can be planned carefully, learned properly and driven well, and still end at the wrong gate on the wrong side of a town.
An error found before setting off costs a few seconds. The same error found on arrival costs the whole journey back.