Yes, fdr, annex 2. I only mentioned annex 2 because FAR 91.703 does. However due my inadequate adeptness at negotiating the rabbit warren of document construction that is ICAO, I am unable to locate the specific requirement for a master document even though my training materials quote ICAO annex 2 as the authoritative source. As to the matter of the plotting chart, the company manual at my last outfit requires it's use while the NAT/MNPS manual only recommends the use of a plotting chart in addition to the required master document. Accordingly I'll concede your point that the plotting chart is NOT required unless it can be shown by some other means that it is.
As to the practical usefulness of a plotting chart, that is strictly a matter of opinion and I'll presume yours to hold greater validity than my own in light of your obviously greater experience in ocean crossings. (as I previously stated I've only done a few crossings) However I personally believe that the chart (properly annotated with position/winds checks) would be of significant assistance in executing the remainder of the flight following NAV loss to a fairly high degree of accuracy. Perhaps even accurately enough to remain within the allotted lateral tolerance. Yes the same thing can be done using only the flight log but the method of plotting the track is perhaps more visually intuitive than the numbers alone. Since I don't prefer to sleep, read magazines or do crosswords while flying, marking a plotting chart isn't any extra trouble at all!
In any case the extremely remote possibility of finding oneself down to compass and clock these days probably renders this discussion entirely academic. But then cynicism just comes to me naturally...
Last edited by westhawk; 27th December 2012 at 04:56.