Tomahawk - your profile says you herald from the UK - many a commercial examiner has told me that the CAA want the commercial flight test to be completed with "route up".
The CAA told me they didn't give a b****r, provided you knew where you were.
AOPA (particularly in USA) have a very active program to combat runway incursions - and they heavily recommend taxiing with a surface chart in your hand and "route up".