Hey Jet Jockey, that's an interesting point. As I am sure you are aware, RNAV approval is simple and the 747 is capable. GNSS would need GPS A/C. It would be very re miss of management to not seek RNAV approval for an A/C that operates worldwide. Literally the delta's in training between a RNAV and non-precision are setting RAIM RNP to .3 and adding 50ft to baro minimums. If they are relying on traditional approaches alone, well it was only a matter of time before something went off the rails. The Wx in YHZ will start to get nasty now until June and regular maintenance of approaches is not something new.
TSB #1 concern is FRMS...Cargo drivers do not follow the same rules. It will be interesting to see how long the crew was on duty. There are new CRM mandatory training for 705 operators that now include TEM. Commanders need to be aware of the possibility of latent threats and call G/A if anything goes off the rails. This has not been ascertained yet but one can assume that he didn't plant the A/C on the markers. No shame in a G/A. TSB report from AC SFO debacle quoted NASA as saying crew were clinically drunk due to fatigue. Very poor decision making ability.
The external pressures will bound to be a contributing factors as well. Was he already behind schedule? Were the lobster that everyone comes to NS for time sensitive? Having to divert due to fuel may have been on his mind as well, hence exasperating the situation.
Time will tell. There for the grace of god go I...