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
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.
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| Radar contact speed |
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