Worksheet 163 · Skill 5

Set and drift

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1. At 1345 your fix is 084°T, 1.0 nm from Westfield church spire. You steer 077°T at 6.0 kn through the water. At 1430 a new fix puts you 251°T, 2.2 nm from Tern Island tower.

   Plot the 1430 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0830 your fix is 262°T, 2.9 nm from Tern Island tower. You steer 120°T at 5.1 kn through the water. At 0910 a new fix puts you 274°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 0910 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0835 your fix is 214°T, 2.1 nm from Tern Island tower. You steer 242°T at 4.0 kn through the water. At 0935 a new fix puts you 075°T, 2.3 nm from Heron Point Light.

   Plot the 0935 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0950 your fix is 254°T, 2.3 nm from Gannet Rock daybeacon. You steer 093°T at 6.1 kn through the water. At 1025 a new fix puts you 125°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1025 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1105 your fix is 132°T, 1.2 nm from Westfield church spire. You steer 102°T at 5.1 kn through the water. At 1225 a new fix puts you 179°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1225 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1035 your fix is 336°T, 2.3 nm from Tern Island tower. You steer 200°T at 4.9 kn through the water. At 1130 a new fix puts you 001°T, 2.7 nm from Mill stack.

   Plot the 1130 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0950 your fix is 245°T, 2.9 nm from Tern Island tower. You steer 105°T at 6.4 kn through the water. At 1025 a new fix puts you 296°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1025 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0745 your fix is 033°T, 2.2 nm from Mill stack. You steer 025°T at 6.6 kn through the water. At 0815 a new fix puts you 352°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0815 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn