Worksheet 52 · Skill 5

Set and drift

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1. At 1420 your fix is 077°T, 2.7 nm from Westfield church spire. You steer 111°T at 5.6 kn through the water. At 1540 a new fix puts you 136°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1540 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1035 your fix is 005°T, 1.9 nm from Heron Point Light. You steer 027°T at 5.8 kn through the water. At 1120 a new fix puts you 041°T, 4.8 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1340 your fix is 068°T, 3.5 nm from Westfield church spire. You steer 076°T at 5.0 kn through the water. At 1410 a new fix puts you 300°T, 2.8 nm from Tern Island tower.

   Plot the 1410 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  

4. At 1340 your fix is 217°T, 2.2 nm from Tern Island tower. You steer 270°T at 5.3 kn through the water. At 1425 a new fix puts you 096°T, 2.3 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0750 your fix is 358°T, 1.7 nm from Heron Point Light. You steer 083°T at 4.7 kn through the water. At 0850 a new fix puts you 349°T, 2.2 nm from Mill stack.

   Plot the 0850 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 0950 your fix is 319°T, 2.0 nm from Mill stack. You steer 021°T at 8.3 kn through the water. At 1035 a new fix puts you 342°T, 2.1 nm from Tern Island tower.

   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  

7. At 1130 your fix is 079°T, 2.9 nm from Tern Island tower. You steer 282°T at 5.5 kn through the water. At 1205 a new fix puts you 322°T, 1.8 nm from Tern Island tower.

   Plot the 1205 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 1510 your fix is 240°T, 1.7 nm from Tern Island tower. You steer 288°T at 6.7 kn through the water. At 1555 a new fix puts you 030°T, 2.7 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn