I believe that the MNPS manual strongly suggests the post position plot for starters. Now that in it's self is not regulatory so you simply have to weigh your experience with the concept of good operating practice. I'm pretty sure that there are some well known airlines that probably do not plot. I know for a fact that there are airlines that do not plot when on a airway that is in the NDB. They are however required to carry a plotting chart with them in the event of a reroute that is off airway. If your operating under FAA oversight I believe that the inspectors handbook has some language regarding this issue as well.
From personal experience I can tell you that it has saved be from making an even more egregious error than I had made earlier in the flight. For the time it takes it's cheap insurance that you are where you think you are and where you think your going.
Last edited by Spooky 2; 13th Mar 2008 at 21:52.