Worksheet 110 · Skill 5

Set and drift

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1. At 0800 your fix is 032°T, 2.4 nm from Tern Island tower. You steer 248°T at 4.9 kn through the water. At 0915 a new fix puts you 279°T, 2.5 nm from Tern Island tower.

   Plot the 0915 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0940 your fix is 224°T, 2.0 nm from Gannet Rock daybeacon. You steer 270°T at 4.5 kn through the water. At 1045 a new fix puts you 349°T, 2.0 nm from Heron Point Light.

   Plot the 1045 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  

3. At 0840 your fix is 351°T, 1.1 nm from Heron Point Light. You steer 348°T at 7.0 kn through the water. At 0920 a new fix puts you 034°T, 2.6 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0730 your fix is 144°T, 1.6 nm from Gannet Rock daybeacon. You steer 300°T at 6.9 kn through the water. At 0820 a new fix puts you 259°T, 2.6 nm from Tern Island tower.

   Plot the 0820 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 1330 your fix is 200°T, 1.5 nm from Tern Island tower. You steer 226°T at 5.5 kn through the water. At 1415 a new fix puts you 333°T, 1.2 nm from Mill stack.

   Plot the 1415 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  

6. At 0940 your fix is 035°T, 2.8 nm from Tern Island tower. You steer 250°T at 5.1 kn through the water. At 1045 a new fix puts you 293°T, 3.1 nm from Tern Island tower.

   Plot the 1045 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 1155 your fix is 321°T, 2.9 nm from Tern Island tower. You steer 182°T at 5.1 kn through the water. At 1245 a new fix puts you 012°T, 2.9 nm from Mill stack.

   Plot the 1245 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  

8. At 1220 your fix is 199°T, 1.5 nm from Tern Island tower. You steer 104°T at 4.7 kn through the water. At 1330 a new fix puts you 348°T, 1.5 nm from Kittle water tank.

   Plot the 1330 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn