Worksheet 86 · Skill 5

Set and drift

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1. At 0955 your fix is 029°T, 4.1 nm from Westfield church spire. You steer 159°T at 6.5 kn through the water. At 1100 a new fix puts you 041°T, 3.1 nm from Heron Point Light.

   Plot the 1100 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1205 your fix is 086°T, 1.6 nm from Tern Island tower. You steer 017°T at 4.3 kn through the water. At 1235 a new fix puts you 059°T, 2.7 nm from Tern Island tower.

   Plot the 1235 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 1510 your fix is 276°T, 1.7 nm from Tern Island tower. You steer 152°T at 7.6 kn through the water. At 1545 a new fix puts you 245°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1545 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 1110 your fix is 251°T, 2.4 nm from Tern Island tower. You steer 146°T at 4.2 kn through the water. At 1145 a new fix puts you 358°T, 3.1 nm from Mill stack.

   Plot the 1145 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 1335 your fix is 016°T, 1.2 nm from Westfield church spire. You steer 097°T at 4.6 kn through the water. At 1420 a new fix puts you 245°T, 3.1 nm from Tern Island tower.

   Plot the 1420 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 1115 your fix is 306°T, 1.1 nm from Gannet Rock daybeacon. You steer 073°T at 4.9 kn through the water. At 1145 a new fix puts you 042°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1145 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  

7. At 1510 your fix is 099°T, 1.6 nm from Gannet Rock daybeacon. You steer 328°T at 6.9 kn through the water. At 1545 a new fix puts you 092°T, 2.3 nm from Tern Island tower.

   Plot the 1545 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 1530 your fix is 349°T, 1.9 nm from Heron Point Light. You steer 038°T at 5.5 kn through the water. At 1635 a new fix puts you 300°T, 2.8 nm from Tern Island tower.

   Plot the 1635 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn