Worksheet 430 · Skill 5

Set and drift

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1. At 1330 your fix is 033°T, 1.9 nm from Heron Point Light. You steer 097°T at 4.3 kn through the water. At 1420 a new fix puts you 220°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1420 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 0955 your fix is 263°T, 2.0 nm from Tern Island tower. You steer 047°T at 4.5 kn through the water. At 1045 a new fix puts you 352°T, 2.3 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1540 your fix is 214°T, 2.7 nm from Tern Island tower. You steer 090°T at 4.5 kn through the water. At 1615 a new fix puts you 302°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1615 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  

4. At 1115 your fix is 271°T, 3.1 nm from Tern Island tower. You steer 186°T at 4.2 kn through the water. At 1155 a new fix puts you 025°T, 2.6 nm from Heron Point Light.

   Plot the 1155 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  

5. At 1510 your fix is 177°T, 1.4 nm from Tern Island tower. You steer 204°T at 4.0 kn through the water. At 1540 a new fix puts you 015°T, 2.9 nm from Mill stack.

   Plot the 1540 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 0835 your fix is 322°T, 0.9 nm from Gannet Rock daybeacon. You steer 256°T at 4.0 kn through the water. At 1005 a new fix puts you 138°T, 1.4 nm from Westfield church spire.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1515 your fix is 243°T, 2.0 nm from Gannet Rock daybeacon. You steer 080°T at 8.8 kn through the water. At 1550 a new fix puts you 085°T, 2.9 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1525 your fix is 050°T, 3.3 nm from Gannet Rock daybeacon. You steer 249°T at 6.3 kn through the water. At 1615 a new fix puts you 191°T, 1.6 nm from Tern Island tower.

   Plot the 1615 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