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hello sailors im captain tom tercy from the maryland school of sailing and seamanship when we do our navigational plotting on paper charts we plot everything all of our bearings and courses in true degrees because its easier faster and more accurate than plotting in magnetic degrees and to do this we use this plastic triangle this protractor triangle in conjunction with our parallel rules let me show you the details heres delaware bay i have this compass rose here in this compass rose here now on the actual paper chart this is uh over a foot of distance and if i use parallel rules on the magnetic rows here so you have to more or less squint your eyes and be able to pick out those numbers and then you put your parallel rules to measure a direction and then you walk it across this chart with maybe six or seven or eight steps of the parallel rules and by the time you do that chances are that you have slipped the parallel rules to some degree so we use a plotting triangle that has a pr