Worksheet 381 · Skill 5

Set and drift

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1. At 1040 your fix is 047°T, 1.2 nm from Gannet Rock daybeacon. You steer 262°T at 8.2 kn through the water. At 1130 a new fix puts you 042°T, 1.1 nm from Heron Point Light.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1130 your fix is 210°T, 0.8 nm from Gannet Rock daybeacon. You steer 294°T at 5.7 kn through the water. At 1235 a new fix puts you 248°T, 3.5 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0845 your fix is 332°T, 1.1 nm from Heron Point Light. You steer 116°T at 7.6 kn through the water. At 0915 a new fix puts you 341°T, 1.1 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1305 your fix is 139°T, 1.4 nm from Tern Island tower. You steer 264°T at 8.6 kn through the water. At 1355 a new fix puts you 019°T, 2.1 nm from Heron Point Light.

   Plot the 1355 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 1315 your fix is 040°T, 4.5 nm from Westfield church spire. You steer 143°T at 7.8 kn through the water. At 1350 a new fix puts you 226°T, 2.4 nm from Tern Island tower.

   Plot the 1350 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 1250 your fix is 067°T, 3.0 nm from Gannet Rock daybeacon. You steer 300°T at 5.3 kn through the water. At 1330 a new fix puts you 023°T, 2.0 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0815 your fix is 005°T, 2.8 nm from Mill stack. You steer 332°T at 9.0 kn through the water. At 0845 a new fix puts you 062°T, 3.6 nm from Westfield church spire.

   Plot the 0845 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 0910 your fix is 024°T, 3.2 nm from Westfield church spire. You steer 087°T at 6.7 kn through the water. At 1005 a new fix puts you 355°T, 2.6 nm from Tern Island tower.

   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