Worksheet 627 · Skill 5

Set and drift

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1. At 1600 your fix is 138°T, 2.6 nm from Tern Island tower. You steer 226°T at 6.5 kn through the water. At 1630 a new fix puts you 032°T, 1.7 nm from Mill stack.

   Plot the 1630 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 1340 your fix is 048°T, 3.4 nm from Gannet Rock daybeacon. You steer 294°T at 4.4 kn through the water. At 1505 a new fix puts you 020°T, 2.6 nm from Tern Island tower.

   Plot the 1505 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1145 your fix is 328°T, 2.4 nm from Tern Island tower. You steer 105°T at 7.8 kn through the water. At 1225 a new fix puts you 034°T, 3.4 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1320 your fix is 301°T, 4.3 nm from Tern Island tower. You steer 147°T at 5.8 kn through the water. At 1355 a new fix puts you 209°T, 2.1 nm from Tern Island tower.

   Plot the 1355 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 0950 your fix is 041°T, 3.8 nm from Gannet Rock daybeacon. You steer 250°T at 4.5 kn through the water. At 1035 a new fix puts you 332°T, 1.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1515 your fix is 045°T, 1.1 nm from Heron Point Light. You steer 010°T at 4.2 kn through the water. At 1645 a new fix puts you 253°T, 1.5 nm from Tern Island tower.

   Plot the 1645 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  

7. At 0740 your fix is 033°T, 3.7 nm from Gannet Rock daybeacon. You steer 237°T at 4.6 kn through the water. At 0855 a new fix puts you 254°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0855 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  

8. At 1600 your fix is 017°T, 3.7 nm from Westfield church spire. You steer 139°T at 6.6 kn through the water. At 1630 a new fix puts you 065°T, 3.1 nm from Westfield church spire.

   Plot the 1630 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