Worksheet 614 · Skill 5

Set and drift

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1. At 1415 your fix is 058°T, 1.6 nm from Westfield church spire. You steer 102°T at 8.1 kn through the water. At 1455 a new fix puts you 274°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1455 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  

2. At 0925 your fix is 062°T, 4.2 nm from Tern Island tower. You steer 195°T at 5.5 kn through the water. At 1035 a new fix puts you 337°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1035 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  

3. At 0905 your fix is 346°T, 2.2 nm from Mill stack. You steer 321°T at 5.9 kn through the water. At 1015 a new fix puts you 295°T, 4.2 nm from Tern Island tower.

   Plot the 1015 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  

4. At 0815 your fix is 134°T, 2.8 nm from Tern Island tower. You steer 261°T at 7.0 kn through the water. At 0925 a new fix puts you 011°T, 2.2 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1050 your fix is 232°T, 2.9 nm from Tern Island tower. You steer 025°T at 5.7 kn through the water. At 1125 a new fix puts you 333°T, 2.0 nm from Tern Island tower.

   Plot the 1125 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 1215 your fix is 018°T, 2.7 nm from Mill stack. You steer 262°T at 4.1 kn through the water. At 1245 a new fix puts you 340°T, 2.2 nm from Mill stack.

   Plot the 1245 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  

7. At 0805 your fix is 348°T, 3.1 nm from Kittle water tank. You steer 023°T at 5.1 kn through the water. At 0840 a new fix puts you 020°T, 2.5 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0710 your fix is 034°T, 1.2 nm from Heron Point Light. You steer 026°T at 8.3 kn through the water. At 0740 a new fix puts you 288°T, 2.8 nm from Tern Island tower.

   Plot the 0740 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