Worksheet 477 · Skill 5

Set and drift

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1. At 0815 your fix is 106°T, 1.6 nm from Westfield church spire. You steer 050°T at 4.6 kn through the water. At 0920 a new fix puts you 317°T, 3.5 nm from Tern Island tower.

   Plot the 0920 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0910 your fix is 294°T, 1.6 nm from Gannet Rock daybeacon. You steer 231°T at 4.9 kn through the water. At 1005 a new fix puts you 031°T, 1.6 nm from Mill stack.

   Plot the 1005 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  

3. At 1600 your fix is 002°T, 1.5 nm from Gannet Rock daybeacon. You steer 266°T at 6.3 kn through the water. At 1645 a new fix puts you 232°T, 3.4 nm from Tern Island tower.

   Plot the 1645 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  

4. At 1005 your fix is 053°T, 3.5 nm from Westfield church spire. You steer 129°T at 5.4 kn through the water. At 1055 a new fix puts you 259°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1055 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0700 your fix is 330°T, 1.3 nm from Heron Point Light. You steer 025°T at 7.3 kn through the water. At 0750 a new fix puts you 290°T, 3.0 nm from Tern Island tower.

   Plot the 0750 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0835 your fix is 247°T, 1.7 nm from Gannet Rock daybeacon. You steer 274°T at 5.8 kn through the water. At 0940 a new fix puts you 350°T, 1.4 nm from Heron Point Light.

   Plot the 0940 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0720 your fix is 269°T, 1.8 nm from Tern Island tower. You steer 176°T at 6.4 kn through the water. At 0750 a new fix puts you 356°T, 3.1 nm from Mill stack.

   Plot the 0750 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  

8. At 1535 your fix is 226°T, 1.6 nm from Tern Island tower. You steer 304°T at 5.4 kn through the water. At 1625 a new fix puts you 038°T, 4.4 nm from Westfield church spire.

   Plot the 1625 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn