Worksheet 818 · Skill 5

Set and drift

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1. At 0710 your fix is 038°T, 2.4 nm from Tern Island tower. You steer 164°T at 8.7 kn through the water. At 0750 a new fix puts you 026°T, 2.4 nm from Kittle water tank.

   Plot the 0750 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 1540 your fix is 009°T, 2.4 nm from Westfield church spire. You steer 135°T at 7.9 kn through the water. At 1615 a new fix puts you 244°T, 3.0 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1120 your fix is 260°T, 1.1 nm from Gannet Rock daybeacon. You steer 274°T at 8.2 kn through the water. At 1210 a new fix puts you 002°T, 2.0 nm from Heron Point Light.

   Plot the 1210 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  

4. At 1455 your fix is 008°T, 2.0 nm from Heron Point Light. You steer 345°T at 7.0 kn through the water. At 1525 a new fix puts you 034°T, 1.4 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1225 your fix is 303°T, 3.2 nm from Tern Island tower. You steer 176°T at 4.8 kn through the water. At 1315 a new fix puts you 059°T, 3.2 nm from Heron Point Light.

   Plot the 1315 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  

6. At 1125 your fix is 073°T, 2.3 nm from Tern Island tower. You steer 155°T at 8.9 kn through the water. At 1155 a new fix puts you 104°T, 2.1 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  

7. At 1350 your fix is 009°T, 1.9 nm from Kittle water tank. You steer 272°T at 7.7 kn through the water. At 1435 a new fix puts you 084°T, 1.8 nm from Heron Point Light.

   Plot the 1435 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 0815 your fix is 067°T, 3.8 nm from Westfield church spire. You steer 130°T at 7.9 kn through the water. At 0915 a new fix puts you 199°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0915 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn