Worksheet 594 · Skill 5

Set and drift

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1. At 0820 your fix is 089°T, 1.3 nm from Heron Point Light. You steer 044°T at 4.8 kn through the water. At 0905 a new fix puts you 224°T, 3.4 nm from Tern Island tower.

   Plot the 0905 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  

2. At 1010 your fix is 344°T, 2.4 nm from Mill stack. You steer 094°T at 6.0 kn through the water. At 1100 a new fix puts you 165°T, 1.3 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1135 your fix is 310°T, 2.4 nm from Tern Island tower. You steer 227°T at 8.5 kn through the water. At 1205 a new fix puts you 089°T, 2.8 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0755 your fix is 019°T, 2.8 nm from Mill stack. You steer 267°T at 8.1 kn through the water. At 0825 a new fix puts you 085°T, 1.1 nm from Heron Point Light.

   Plot the 0825 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 1310 your fix is 028°T, 1.1 nm from Heron Point Light. You steer 344°T at 8.5 kn through the water. At 1345 a new fix puts you 038°T, 2.9 nm from Westfield church spire.

   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  

6. At 1525 your fix is 047°T, 3.2 nm from Tern Island tower. You steer 156°T at 6.9 kn through the water. At 1620 a new fix puts you 022°T, 2.1 nm from Kittle water tank.

   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  

7. At 1415 your fix is 053°T, 4.0 nm from Westfield church spire. You steer 073°T at 4.2 kn through the water. At 1510 a new fix puts you 019°T, 1.7 nm from Tern Island tower.

   Plot the 1510 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  

8. At 1350 your fix is 012°T, 2.8 nm from Mill stack. You steer 327°T at 4.8 kn through the water. At 1455 a new fix puts you 055°T, 2.6 nm from Westfield church spire.

   Plot the 1455 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