Worksheet 638 · Skill 5

Set and drift

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1. At 1010 your fix is 052°T, 3.9 nm from Westfield church spire. You steer 141°T at 7.7 kn through the water. At 1040 a new fix puts you 216°T, 2.5 nm from Tern Island tower.

   Plot the 1040 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  

2. At 1005 your fix is 322°T, 3.0 nm from Tern Island tower. You steer 241°T at 5.6 kn through the water. At 1045 a new fix puts you 041°T, 2.3 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1150 your fix is 220°T, 3.2 nm from Tern Island tower. You steer 311°T at 7.6 kn through the water. At 1235 a new fix puts you 019°T, 2.1 nm from Westfield church spire.

   Plot the 1235 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 0935 your fix is 027°T, 2.4 nm from Westfield church spire. You steer 132°T at 7.8 kn through the water. At 1040 a new fix puts you 202°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1040 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  

5. At 1600 your fix is 034°T, 2.5 nm from Heron Point Light. You steer 134°T at 4.1 kn through the water. At 1635 a new fix puts you 062°T, 3.3 nm from Heron Point Light.

   Plot the 1635 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  

6. At 1155 your fix is 185°T, 1.3 nm from Gannet Rock daybeacon. You steer 249°T at 6.4 kn through the water. At 1230 a new fix puts you 004°T, 2.2 nm from Mill stack.

   Plot the 1230 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  

7. At 0835 your fix is 177°T, 1.4 nm from Gannet Rock daybeacon. You steer 285°T at 6.1 kn through the water. At 0925 a new fix puts you 043°T, 1.7 nm from Heron Point Light.

   Plot the 0925 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 1010 your fix is 107°T, 1.6 nm from Tern Island tower. You steer 214°T at 5.1 kn through the water. At 1120 a new fix puts you 020°T, 2.5 nm from Mill stack.

   Plot the 1120 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