Worksheet 739 · Skill 5

Set and drift

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1. At 1415 your fix is 068°T, 3.5 nm from Westfield church spire. You steer 115°T at 8.7 kn through the water. At 1445 a new fix puts you 199°T, 2.2 nm from Tern Island tower.

   Plot the 1445 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 0810 your fix is 009°T, 2.6 nm from Westfield church spire. You steer 101°T at 5.2 kn through the water. At 0900 a new fix puts you 323°T, 2.4 nm from Tern Island tower.

   Plot the 0900 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  

3. At 1520 your fix is 002°T, 2.9 nm from Mill stack. You steer 109°T at 5.8 kn through the water. At 1555 a new fix puts you 068°T, 2.6 nm from Mill stack.

   Plot the 1555 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  

4. At 1525 your fix is 151°T, 0.9 nm from Westfield church spire. You steer 120°T at 5.1 kn through the water. At 1600 a new fix puts you 357°T, 1.4 nm from Heron Point Light.

   Plot the 1600 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  

5. At 1010 your fix is 218°T, 3.4 nm from Tern Island tower. You steer 070°T at 7.1 kn through the water. At 1050 a new fix puts you 026°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1050 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  

6. At 1130 your fix is 159°T, 1.6 nm from Tern Island tower. You steer 048°T at 5.3 kn through the water. At 1220 a new fix puts you 035°T, 3.8 nm from Gannet Rock daybeacon.

   Plot the 1220 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  

7. At 0810 your fix is 157°T, 1.6 nm from Gannet Rock daybeacon. You steer 260°T at 5.0 kn through the water. At 0845 a new fix puts you 066°T, 2.4 nm from Mill stack.

   Plot the 0845 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 1455 your fix is 200°T, 0.9 nm from Gannet Rock daybeacon. You steer 286°T at 4.8 kn through the water. At 1610 a new fix puts you 262°T, 2.6 nm from Tern Island tower.

   Plot the 1610 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