- Apr 11, 2001
Boxhall was talking about the methods that gave latitude and longitude purely by calculation, with no plotting on a plotting chart. You observed stars lying roughly east or west for longitude and stars lying north or south for latitude. The Mark St-Hillaire method was only required for Extra Masters and old hands regarded it with suspicion, because of the plotting and possible errors. The old methods made a comeback in the 1980s, using programmable calculators that also contained data about the celestial bodies. I assume the work can now be done on a computer.