Worksheet 637 · Skill 5

Set and drift

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1. At 1335 your fix is 088°T, 2.2 nm from Tern Island tower. You steer 217°T at 4.1 kn through the water. At 1410 a new fix puts you 267°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1410 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 1545 your fix is 209°T, 3.2 nm from Tern Island tower. You steer 333°T at 4.8 kn through the water. At 1620 a new fix puts you 265°T, 3.7 nm from Tern Island tower.

   Plot the 1620 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 1020 your fix is 078°T, 1.6 nm from Heron Point Light. You steer 061°T at 4.4 kn through the water. At 1055 a new fix puts you 268°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1055 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 1315 your fix is 120°T, 1.2 nm from Gannet Rock daybeacon. You steer 018°T at 5.1 kn through the water. At 1405 a new fix puts you 052°T, 3.7 nm from Tern Island tower.

   Plot the 1405 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 0755 your fix is 293°T, 3.8 nm from Tern Island tower. You steer 229°T at 4.4 kn through the water. At 0840 a new fix puts you 041°T, 1.7 nm from Westfield church spire.

   Plot the 0840 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  

6. At 0940 your fix is 101°T, 1.6 nm from Gannet Rock daybeacon. You steer 260°T at 5.7 kn through the water. At 1050 a new fix puts you 066°T, 1.8 nm from Heron Point Light.

   Plot the 1050 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  

7. At 0900 your fix is 036°T, 3.9 nm from Westfield church spire. You steer 156°T at 5.1 kn through the water. At 1010 a new fix puts you 065°T, 1.9 nm from Heron Point Light.

   Plot the 1010 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  

8. At 0720 your fix is 024°T, 1.0 nm from Heron Point Light. You steer 108°T at 5.3 kn through the water. At 0755 a new fix puts you 048°T, 1.3 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn