Worksheet 288 · Skill 5

Set and drift

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1. At 1355 your fix is 266°T, 3.2 nm from Tern Island tower. You steer 132°T at 7.6 kn through the water. At 1425 a new fix puts you 254°T, 1.2 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1005 your fix is 237°T, 2.9 nm from Tern Island tower. You steer 217°T at 4.9 kn through the water. At 1035 a new fix puts you 062°T, 2.8 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0750 your fix is 243°T, 2.0 nm from Gannet Rock daybeacon. You steer 301°T at 5.1 kn through the water. At 0820 a new fix puts you 223°T, 2.0 nm from Tern Island tower.

   Plot the 0820 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 1100 your fix is 288°T, 3.5 nm from Tern Island tower. You steer 146°T at 7.8 kn through the water. At 1145 a new fix puts you 238°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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1000 your fix is 204°T, 0.9 nm from Gannet Rock daybeacon. You steer 059°T at 4.6 kn through the water. At 1040 a new fix puts you 066°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1040 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  

6. At 1450 your fix is 204°T, 1.3 nm from Tern Island tower. You steer 221°T at 6.9 kn through the water. At 1520 a new fix puts you 353°T, 2.3 nm from Mill stack.

   Plot the 1520 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 1515 your fix is 042°T, 3.1 nm from Tern Island tower. You steer 189°T at 4.9 kn through the water. At 1550 a new fix puts you 019°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1550 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 1520 your fix is 059°T, 1.6 nm from Heron Point Light. You steer 329°T at 4.0 kn through the water. At 1620 a new fix puts you 112°T, 2.5 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn