Looking at the Inmarsat data, the variation in BFO between the contacts is such that I cannot see how a reliably accurate determination of BFO at each of the handshakes can be determined based only on the one value. Way back we heard about some sort of signal 'elevation' determination at the satellite ("40 degree arcs") - was that a false report or was it in fact simply referring to the BTO?
Do I understand that there is NO 'best fit' northerly route based on the BTO/BFOs?