Worksheet 459 · Skill 5

Set and drift

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1. At 1350 your fix is 294°T, 4.2 nm from Tern Island tower. You steer 199°T at 4.0 kn through the water. At 1440 a new fix puts you 027°T, 2.7 nm from Heron Point Light.

   Plot the 1440 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 1315 your fix is 059°T, 3.9 nm from Tern Island tower. You steer 176°T at 6.1 kn through the water. At 1350 a new fix puts you 077°T, 1.9 nm from Gannet Rock daybeacon.

   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  

3. At 0845 your fix is 078°T, 2.2 nm from Westfield church spire. You steer 190°T at 4.8 kn through the water. At 0920 a new fix puts you 353°T, 1.6 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1350 your fix is 017°T, 3.6 nm from Westfield church spire. You steer 133°T at 8.8 kn through the water. At 1430 a new fix puts you 230°T, 1.6 nm from Tern Island tower.

   Plot the 1430 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 1115 your fix is 355°T, 2.8 nm from Mill stack. You steer 100°T at 4.1 kn through the water. At 1230 a new fix puts you 094°T, 3.1 nm from Gannet Rock daybeacon.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1445 your fix is 303°T, 4.2 nm from Tern Island tower. You steer 187°T at 4.3 kn through the water. At 1525 a new fix puts you 063°T, 3.0 nm from Westfield church spire.

   Plot the 1525 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 0735 your fix is 022°T, 2.6 nm from Heron Point Light. You steer 030°T at 4.4 kn through the water. At 0820 a new fix puts you 260°T, 3.3 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0820 your fix is 135°T, 1.0 nm from Gannet Rock daybeacon. You steer 282°T at 7.9 kn through the water. At 0900 a new fix puts you 053°T, 3.4 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn