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this is how we plot a running fixed position assuming the course is zero 80 degrees and the speed is 8 knots or 8 nautical miles per hour we take a bearing of 0 45 degrees on Alpha Rock at 0 900 now convert the compass bearings to true bearings and we plot it on the chart after 30 minutes we take a new bearing on the same rock that reads 0 15 degrees now convert the compass bearings to true bearings and plot it on the chart along with a new time zero 9:30 knowing the speed the next step is to determine the distance that the vessel sailed from zero 900 to 0 934 that we use the formula d is equal to s times T divided by 60 where D is the distance in nautical miles s is the boat speed and T is the time in minutes in our case eight knots times 30 minutes divided by 60 equals 4 nautical miles using the dividers we span a distance of four miles on the latitude scale which is closest to the course line and which runs along the sides of the chart we applied this span on our course placing one
