Worksheet 371 · Skill 5

Set and drift

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1. At 1120 your fix is 253°T, 3.4 nm from Tern Island tower. You steer 354°T at 4.6 kn through the water. At 1155 a new fix puts you 067°T, 3.7 nm from Westfield church spire.

   Plot the 1155 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 0810 your fix is 320°T, 2.2 nm from Tern Island tower. You steer 095°T at 4.2 kn through the water. At 0900 a new fix puts you 006°T, 1.7 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 1355 your fix is 214°T, 2.6 nm from Tern Island tower. You steer 317°T at 6.1 kn through the water. At 1445 a new fix puts you 300°T, 4.3 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1300 your fix is 054°T, 3.2 nm from Gannet Rock daybeacon. You steer 247°T at 4.9 kn through the water. At 1400 a new fix puts you 012°T, 3.0 nm from Mill stack.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1445 your fix is 182°T, 1.6 nm from Gannet Rock daybeacon. You steer 279°T at 5.6 kn through the water. At 1555 a new fix puts you 081°T, 3.2 nm from Westfield church spire.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1240 your fix is 029°T, 2.4 nm from Westfield church spire. You steer 074°T at 4.4 kn through the water. At 1320 a new fix puts you 296°T, 4.4 nm from Tern Island tower.

   Plot the 1320 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 1245 your fix is 057°T, 4.1 nm from Tern Island tower. You steer 172°T at 5.2 kn through the water. At 1320 a new fix puts you 025°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1320 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 1330 your fix is 202°T, 2.7 nm from Tern Island tower. You steer 306°T at 6.3 kn through the water. At 1400 a new fix puts you 094°T, 3.3 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn