Worksheet 756 · Skill 5

Set and drift

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1. At 0910 your fix is 075°T, 1.3 nm from Gannet Rock daybeacon. You steer 286°T at 4.8 kn through the water. At 0945 a new fix puts you 325°T, 0.8 nm from Gannet Rock daybeacon.

   Plot the 0945 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 1025 your fix is 036°T, 2.5 nm from Westfield church spire. You steer 118°T at 4.4 kn through the water. At 1110 a new fix puts you 239°T, 2.8 nm from Tern Island tower.

   Plot the 1110 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  

3. At 1550 your fix is 258°T, 2.6 nm from Gannet Rock daybeacon. You steer 299°T at 4.8 kn through the water. At 1635 a new fix puts you 025°T, 2.8 nm from Heron Point Light.

   Plot the 1635 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  

4. At 1445 your fix is 015°T, 2.1 nm from Mill stack. You steer 356°T at 4.0 kn through the water. At 1515 a new fix puts you 226°T, 1.7 nm from Tern Island tower.

   Plot the 1515 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 0900 your fix is 336°T, 2.3 nm from Tern Island tower. You steer 195°T at 5.2 kn through the water. At 1000 a new fix puts you 238°T, 3.5 nm from Tern Island tower.

   Plot the 1000 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  

6. At 1320 your fix is 088°T, 1.9 nm from Westfield church spire. You steer 068°T at 6.5 kn through the water. At 1400 a new fix puts you 299°T, 2.0 nm from Tern Island tower.

   Plot the 1400 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 1050 your fix is 152°T, 2.4 nm from Tern Island tower. You steer 241°T at 5.9 kn through the water. At 1120 a new fix puts you 006°T, 3.0 nm from Mill stack.

   Plot the 1120 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  

8. At 0810 your fix is 226°T, 1.5 nm from Tern Island tower. You steer 213°T at 5.1 kn through the water. At 0900 a new fix puts you 069°T, 2.0 nm from Heron Point Light.

   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