It makes I laarrff!
A number of years ago, those at the sharp end told the VSOs not to shut off Nav training. Why? Because OSDs always slip to the right and the RAF would catch a cold.
Funny old thing, that is now happening with the GR4 and - surprise, surprise - they are critically short of Navs, to the extent that they are re-recruiting well-known, back seat drongos, which the RAF was more than happy to get rid of of some years ago.
Life is certainly better on the outside looking in!