You
are steering 163°T and a light was picked up
dead ahead at a distance of 11 miles at 0142. You change course to pass the
light 2 miles off abeam to starboard. If you are making 13 knots, what will be
the time when abeam of the light?
Given:
163°T
= Course
0142H = Time during observation
11 nm = Distance of the ligh at 0142H
2 nm = Distance off abeam of the light
What is asked?
Time
when abeam of the light.
Solution:
Step
1. We have to solve for the distance run to abeam by using Pythagorean theory.
Distance = √112 - 22
= √121 – 4
= √117
= 10.8 nm
Step 2. Divide
the 10.8 nm by the speed to get the time interval.
TI = (10.8 nm ÷ 13 knots) x 60
= 49.84 or 50 mins
Step 3. Solving for time
to abeam of the lighthouse. Add Time Interval to the time during observation.
0142H
+
50 min
92 min
+1hr-60
min
0232H is the time when abeam of the
light
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