Worksheet 814 · Skill 5

Set and drift

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1. At 1025 your fix is 246°T, 3.4 nm from Tern Island tower. You steer 114°T at 5.1 kn through the water. At 1105 a new fix puts you 252°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1105 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 1345 your fix is 043°T, 1.2 nm from Kittle water tank. You steer 290°T at 4.5 kn through the water. At 1450 a new fix puts you 032°T, 2.2 nm from Mill stack.

   Plot the 1450 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 1125 your fix is 358°T, 1.8 nm from Gannet Rock daybeacon. You steer 199°T at 7.5 kn through the water. At 1155 a new fix puts you 208°T, 2.4 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1020 your fix is 083°T, 3.0 nm from Gannet Rock daybeacon. You steer 288°T at 6.9 kn through the water. At 1050 a new fix puts you 143°T, 1.5 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1050 your fix is 356°T, 2.1 nm from Heron Point Light. You steer 111°T at 5.2 kn through the water. At 1135 a new fix puts you 346°T, 3.1 nm from Mill stack.

   Plot the 1135 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 1125 your fix is 076°T, 1.2 nm from Heron Point Light. You steer 340°T at 8.2 kn through the water. At 1200 a new fix puts you 002°T, 1.7 nm from Westfield church spire.

   Plot the 1200 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  

7. At 1055 your fix is 234°T, 2.3 nm from Tern Island tower. You steer 303°T at 5.9 kn through the water. At 1145 a new fix puts you 011°T, 3.4 nm from Westfield church spire.

   Plot the 1145 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  

8. At 1245 your fix is 086°T, 2.4 nm from Gannet Rock daybeacon. You steer 231°T at 5.9 kn through the water. At 1325 a new fix puts you 179°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1325 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