Worksheet 763 · Skill 5

Set and drift

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1. At 1515 your fix is 182°T, 1.2 nm from Gannet Rock daybeacon. You steer 304°T at 8.6 kn through the water. At 1545 a new fix puts you 231°T, 2.8 nm from Tern Island tower.

   Plot the 1545 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  

2. At 1040 your fix is 238°T, 3.5 nm from Tern Island tower. You steer 117°T at 4.3 kn through the water. At 1140 a new fix puts you 131°T, 3.2 nm from Tern Island tower.

   Plot the 1140 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  

3. At 1455 your fix is 322°T, 1.5 nm from Gannet Rock daybeacon. You steer 238°T at 4.2 kn through the water. At 1550 a new fix puts you 226°T, 2.9 nm from Tern Island tower.

   Plot the 1550 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0955 your fix is 038°T, 2.3 nm from Gannet Rock daybeacon. You steer 257°T at 4.0 kn through the water. At 1035 a new fix puts you 110°T, 1.4 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1425 your fix is 312°T, 3.1 nm from Tern Island tower. You steer 211°T at 4.8 kn through the water. At 1545 a new fix puts you 330°T, 1.8 nm from Heron Point Light.

   Plot the 1545 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0825 your fix is 107°T, 1.8 nm from Westfield church spire. You steer 107°T at 5.2 kn through the water. At 0925 a new fix puts you 150°T, 2.4 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1225 your fix is 034°T, 2.2 nm from Heron Point Light. You steer 036°T at 5.5 kn through the water. At 1315 a new fix puts you 334°T, 1.3 nm from Tern Island tower.

   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  

8. At 1315 your fix is 321°T, 1.3 nm from Kittle water tank. You steer 308°T at 6.5 kn through the water. At 1430 a new fix puts you 072°T, 3.1 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn