Worksheet 410 · Skill 5

Set and drift

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1. At 1150 your fix is 072°T, 1.9 nm from Heron Point Light. You steer 026°T at 7.1 kn through the water. At 1235 a new fix puts you 287°T, 1.7 nm from Tern Island tower.

   Plot the 1235 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  

2. At 1010 your fix is 028°T, 3.0 nm from Westfield church spire. You steer 136°T at 5.5 kn through the water. At 1105 a new fix puts you 082°T, 3.3 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1410 your fix is 150°T, 1.2 nm from Gannet Rock daybeacon. You steer 011°T at 5.7 kn through the water. At 1505 a new fix puts you 071°T, 4.3 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1235 your fix is 262°T, 3.6 nm from Tern Island tower. You steer 129°T at 5.3 kn through the water. At 1305 a new fix puts you 235°T, 3.1 nm from Tern Island tower.

   Plot the 1305 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 1340 your fix is 283°T, 3.9 nm from Tern Island tower. You steer 157°T at 7.4 kn through the water. At 1430 a new fix puts you 248°T, 2.6 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0800 your fix is 068°T, 2.1 nm from Westfield church spire. You steer 218°T at 5.1 kn through the water. At 0830 a new fix puts you 339°T, 1.5 nm from Heron Point Light.

   Plot the 0830 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 1025 your fix is 072°T, 2.8 nm from Gannet Rock daybeacon. You steer 224°T at 4.3 kn through the water. At 1100 a new fix puts you 338°T, 2.9 nm from Kittle water tank.

   Plot the 1100 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 1410 your fix is 219°T, 2.4 nm from Gannet Rock daybeacon. You steer 053°T at 4.0 kn through the water. At 1525 a new fix puts you 077°T, 1.6 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn