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Published byHollie Bruce Modified over 9 years ago
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CALCULATING TIME, SPEED & DISTANCE 2011
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Time / Distance / Speed Calculations
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All these calculations revolve around the following formula 60D = T S
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Time / Distance / Speed Calculations T = time in minutes S = speed in knots D = distance in nautical miles 60D = T S
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Calculating an ETA
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Measure the distance along the course line to the destination in nautical miles
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Calculating an ETA
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The distance from Ladysmith (top left hand corner) to off Norway Island is 12.9 nautical miles. Using 60D = T S 60 x 12.9 = T in minutes = 25.8 minutes 30
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Calculating an ETA Add this time to the the departure time, e.g. 0800 LT, and your ETA off Norway Island will be around 0825 LT.
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6 Minute Finger Method
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This method may be used with either dividers or fingers held a set distance apart for a rapid estimation of distance.
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6 Minute Finger Method At 30 knots the vessel will travel 3 nautical miles every 6 minutes. Set dividers to 3 nautical miles on the latitude scale, and then run them down the course line counting off 6 minutes as you go.
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6 Minute Finger Method
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Alternatively put two fingers over the 3 nautical miles on the latitude scale, and then run them down the course line counting off 6 minutes as you go. This will give you somewhere around 24 minutes plus for a time travelled.
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