Seeing as I don't really have experience at this and am trying to learn more....perhaps a detailed response to this earlier statement by another poster
" it is still difficult to see what the immediate gain is for a plot vs other means of cross checking of reasonableness. A check of total distances, L/L or track/distances for each leg between the FMC/FMCGS and the flight plan is sufficient to give a safeguard for gross procedural error and a basis for navigation reversion in the case of multiple system losses dumping you into a life of no GPS or INS, just the compass and clock."
Last edited by JammedStab; 27th Dec 2012 at 09:21.