Putnam, G. R. (George Rockwell), b. 1865 · New York, J. Wiley & Sons; [etc.] · leaf 144
Dead Reckoning 129 meridian. Another method is to compute positions withtwo assumed latitudes and plot the two resulting posi-tions and draw a line through them. The vessel mustbe somewhere on the resulting Sumner line. A gooddetermination may be obtained by the intersection oftwo Sumner lines…
Nautical charts
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