Worksheet 218 · Skill 5

Set and drift

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1. At 1110 your fix is 048°T, 2.6 nm from Tern Island tower. You steer 168°T at 8.1 kn through the water. At 1145 a new fix puts you 151°T, 1.6 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1310 your fix is 355°T, 1.4 nm from Gannet Rock daybeacon. You steer 064°T at 4.2 kn through the water. At 1345 a new fix puts you 042°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1345 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 0705 your fix is 018°T, 1.2 nm from Heron Point Light. You steer 347°T at 5.2 kn through the water. At 0735 a new fix puts you 063°T, 2.5 nm from Westfield church spire.

   Plot the 0735 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 1420 your fix is 272°T, 3.4 nm from Tern Island tower. You steer 136°T at 7.3 kn through the water. At 1450 a new fix puts you 012°T, 2.8 nm from Mill stack.

   Plot the 1450 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  

5. At 1020 your fix is 310°T, 1.6 nm from Tern Island tower. You steer 247°T at 6.1 kn through the water. At 1105 a new fix puts you 070°T, 2.3 nm from Westfield church spire.

   Plot the 1105 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 0725 your fix is 058°T, 3.6 nm from Westfield church spire. You steer 218°T at 7.4 kn through the water. At 0800 a new fix puts you 355°T, 1.8 nm from Heron Point Light.

   Plot the 0800 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  

7. At 1445 your fix is 046°T, 1.9 nm from Tern Island tower. You steer 273°T at 9.0 kn through the water. At 1515 a new fix puts you 301°T, 3.3 nm from Tern Island tower.

   Plot the 1515 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  

8. At 1415 your fix is 285°T, 2.5 nm from Tern Island tower. You steer 189°T at 7.2 kn through the water. At 1450 a new fix puts you 040°T, 2.7 nm from Heron Point Light.

   Plot the 1450 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