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Calculate Radar Contact's Speed

You are underway at 10 knots. At 1800 you note a radar contact dead ahead at a range of 10 miles. At 0812 the contact is dead ahead at a range of 8 miles. The estimated speed of the contact is ____ .

Given:

Own ship speed = 10 knots
           Distance = 10 miles at 1800H
                          = 8 miles at 0812H

What is asked:

Speed of the contact

Solution:

1. We have to get first the distance traveled and the time interval.
             
                                10 miles at 0800H
                               -  8 miles at 0812H 
                  Distance= 2                 12 min = Time interval

2. We can now proceed to the formula in getting contact's speed.

     Contact's Speed = (Distance ÷ Time) × 60) +/- Own Speed
                                = (2 miles ÷ 12 min) × 60) - 10 knots  (minus because head-on & reciprocal course)
                                = 10 knots - 10 knots
     Contact's Speed = 0 knot. That means the contact is dead in the water.

                      
Radar contact speed

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