Worksheet 164 · Skill 5

Set and drift

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1. At 1430 your fix is 271°T, 1.8 nm from Gannet Rock daybeacon. You steer 319°T at 5.1 kn through the water. At 1505 a new fix puts you 284°T, 2.6 nm from Tern Island tower.

   Plot the 1505 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 0845 your fix is 077°T, 3.0 nm from Westfield church spire. You steer 044°T at 4.5 kn through the water. At 0940 a new fix puts you 352°T, 2.4 nm from Tern Island tower.

   Plot the 0940 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  

3. At 1355 your fix is 189°T, 1.7 nm from Tern Island tower. You steer 132°T at 5.4 kn through the water. At 1435 a new fix puts you 350°T, 1.5 nm from Kittle water tank.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1455 your fix is 088°T, 2.1 nm from Tern Island tower. You steer 112°T at 5.6 kn through the water. At 1525 a new fix puts you 071°T, 2.7 nm from Gannet Rock daybeacon.

   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 1410 your fix is 214°T, 2.2 nm from Gannet Rock daybeacon. You steer 332°T at 5.1 kn through the water. At 1520 a new fix puts you 266°T, 3.4 nm from Tern Island tower.

   Plot the 1520 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  

6. At 0945 your fix is 219°T, 2.9 nm from Tern Island tower. You steer 354°T at 6.4 kn through the water. At 1025 a new fix puts you 315°T, 3.6 nm from Tern Island tower.

   Plot the 1025 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  

7. At 1305 your fix is 038°T, 2.6 nm from Gannet Rock daybeacon. You steer 257°T at 7.0 kn through the water. At 1405 a new fix puts you 068°T, 2.1 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1120 your fix is 224°T, 2.0 nm from Gannet Rock daybeacon. You steer 092°T at 8.4 kn through the water. At 1150 a new fix puts you 075°T, 1.6 nm from Kittle water tank.

   Plot the 1150 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