Worksheet 636 · Skill 5

Set and drift

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1. At 1525 your fix is 018°T, 2.5 nm from Mill stack. You steer 096°T at 6.1 kn through the water. At 1620 a new fix puts you 126°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1620 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1400 your fix is 341°T, 2.0 nm from Mill stack. You steer 003°T at 8.6 kn through the water. At 1435 a new fix puts you 279°T, 2.9 nm from Tern Island tower.

   Plot the 1435 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  

3. At 1245 your fix is 058°T, 3.2 nm from Heron Point Light. You steer 014°T at 8.7 kn through the water. At 1320 a new fix puts you 323°T, 3.0 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0915 your fix is 336°T, 1.4 nm from Gannet Rock daybeacon. You steer 034°T at 4.9 kn through the water. At 1000 a new fix puts you 041°T, 4.2 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1300 your fix is 057°T, 2.9 nm from Heron Point Light. You steer 328°T at 5.6 kn through the water. At 1330 a new fix puts you 083°T, 3.7 nm from Westfield church spire.

   Plot the 1330 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  

6. At 1115 your fix is 356°T, 1.4 nm from Tern Island tower. You steer 280°T at 4.7 kn through the water. At 1240 a new fix puts you 040°T, 3.2 nm from Westfield church spire.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1240 your fix is 332°T, 2.0 nm from Tern Island tower. You steer 211°T at 5.0 kn through the water. At 1350 a new fix puts you 056°T, 2.6 nm from Heron Point Light.

   Plot the 1350 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  

8. At 1350 your fix is 203°T, 2.4 nm from Tern Island tower. You steer 228°T at 6.1 kn through the water. At 1425 a new fix puts you 338°T, 1.6 nm from Mill stack.

   Plot the 1425 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