Worksheet 45 · Skill 5

Set and drift

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1. At 1055 your fix is 000°T, 1.6 nm from Gannet Rock daybeacon. You steer 204°T at 8.3 kn through the water. At 1130 a new fix puts you 046°T, 1.7 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0900 your fix is 016°T, 1.5 nm from Tern Island tower. You steer 279°T at 4.6 kn through the water. At 0935 a new fix puts you 300°T, 3.2 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0815 your fix is 001°T, 1.4 nm from Heron Point Light. You steer 048°T at 6.4 kn through the water. At 0900 a new fix puts you 280°T, 2.2 nm from Tern Island tower.

   Plot the 0900 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 0725 your fix is 022°T, 2.5 nm from Gannet Rock daybeacon. You steer 136°T at 5.3 kn through the water. At 0755 a new fix puts you 057°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 0755 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  

5. At 1520 your fix is 119°T, 1.5 nm from Westfield church spire. You steer 050°T at 7.3 kn through the water. At 1550 a new fix puts you 280°T, 3.6 nm from Tern Island tower.

   Plot the 1550 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  

6. At 1215 your fix is 022°T, 2.3 nm from Tern Island tower. You steer 248°T at 6.4 kn through the water. At 1250 a new fix puts you 302°T, 3.3 nm from Tern Island tower.

   Plot the 1250 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 0800 your fix is 164°T, 1.2 nm from Gannet Rock daybeacon. You steer 299°T at 5.0 kn through the water. At 0925 a new fix puts you 337°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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1330 your fix is 340°T, 1.8 nm from Mill stack. You steer 294°T at 6.5 kn through the water. At 1400 a new fix puts you 128°T, 1.8 nm from Westfield church spire.

   Plot the 1400 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