Worksheet 405 · Skill 5

Set and drift

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1. At 1225 your fix is 201°T, 2.2 nm from Tern Island tower. You steer 201°T at 5.8 kn through the water. At 1300 a new fix puts you 337°T, 1.5 nm from Mill stack.

   Plot the 1300 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 1210 your fix is 197°T, 2.0 nm from Gannet Rock daybeacon. You steer 299°T at 4.0 kn through the water. At 1240 a new fix puts you 008°T, 2.4 nm from Mill stack.

   Plot the 1240 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  

3. At 1000 your fix is 075°T, 3.8 nm from Tern Island tower. You steer 228°T at 6.8 kn through the water. At 1040 a new fix puts you 262°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1040 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 1150 your fix is 142°T, 1.6 nm from Gannet Rock daybeacon. You steer 291°T at 4.3 kn through the water. At 1225 a new fix puts you 214°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1225 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 1030 your fix is 298°T, 2.5 nm from Tern Island tower. You steer 077°T at 9.0 kn through the water. At 1110 a new fix puts you 068°T, 5.2 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1430 your fix is 071°T, 2.4 nm from Westfield church spire. You steer 141°T at 7.3 kn through the water. At 1510 a new fix puts you 042°T, 1.5 nm from Mill stack.

   Plot the 1510 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 0755 your fix is 301°T, 3.8 nm from Tern Island tower. You steer 179°T at 7.8 kn through the water. At 0845 a new fix puts you 343°T, 2.6 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1345 your fix is 206°T, 2.0 nm from Gannet Rock daybeacon. You steer 286°T at 6.0 kn through the water. At 1415 a new fix puts you 351°T, 2.2 nm from Mill stack.

   Plot the 1415 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