Worksheet 626 · Skill 5

Set and drift

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1. At 0820 your fix is 050°T, 3.1 nm from Heron Point Light. You steer 007°T at 7.6 kn through the water. At 0850 a new fix puts you 292°T, 3.1 nm from Tern Island tower.

   Plot the 0850 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 1455 your fix is 242°T, 3.3 nm from Tern Island tower. You steer 099°T at 5.7 kn through the water. At 1530 a new fix puts you 171°T, 1.5 nm from Tern Island tower.

   Plot the 1530 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 1025 your fix is 053°T, 3.4 nm from Westfield church spire. You steer 214°T at 6.8 kn through the water. At 1055 a new fix puts you 136°T, 1.8 nm from Westfield church spire.

   Plot the 1055 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 1240 your fix is 278°T, 1.2 nm from Gannet Rock daybeacon. You steer 305°T at 4.6 kn through the water. At 1410 a new fix puts you 076°T, 3.1 nm from Westfield church spire.

   Plot the 1410 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1000 your fix is 312°T, 1.4 nm from Kittle water tank. You steer 041°T at 7.1 kn through the water. At 1035 a new fix puts you 063°T, 3.1 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0745 your fix is 106°T, 2.4 nm from Westfield church spire. You steer 079°T at 6.9 kn through the water. At 0820 a new fix puts you 231°T, 2.0 nm from Tern Island tower.

   Plot the 0820 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 1400 your fix is 027°T, 2.7 nm from Tern Island tower. You steer 237°T at 6.1 kn through the water. At 1530 a new fix puts you 055°T, 3.0 nm from Westfield church spire.

   Plot the 1530 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0710 your fix is 082°T, 2.4 nm from Westfield church spire. You steer 152°T at 6.3 kn through the water. At 0745 a new fix puts you 086°T, 1.6 nm from Heron Point Light.

   Plot the 0745 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