Calculate The Speed Of The Vessel

A vessel in latitude 55° 12' N sails on course 270° T and make a Dlo of 21° 36.6'. If the time taken was 3 days  2 hours, find the vessel's speed.

Given:

                              Time = 3 days 2 hrs or 74 hrs
                         Latitude = 55° 12' N
Difference Of Longitude = 21° 36.6'

What is asked?

Vessel's Speed

Solution:

1. We have to solve first for the distance traveled.
                       Distance = Dlo × Cos Latitude
                                      = 21° 36.6' × Cos 55° 12'
                                      = 12.33 miles

2. Now solving for the vessel's speed.
                          Speed = (Distance ÷ Time) × 60
                                     = (12.33 ÷ 74) × 60
                                     = 0.16662 × 60
                                     = 10 knots

             

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