Worksheet 298 · Skill 5

Set and drift

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1. At 1105 your fix is 123°T, 1.8 nm from Westfield church spire. You steer 059°T at 8.2 kn through the water. At 1135 a new fix puts you 254°T, 2.6 nm from Tern Island tower.

   Plot the 1135 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 1440 your fix is 234°T, 1.6 nm from Gannet Rock daybeacon. You steer 021°T at 4.7 kn through the water. At 1525 a new fix puts you 028°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1525 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 1020 your fix is 355°T, 3.3 nm from Mill stack. You steer 284°T at 6.1 kn through the water. At 1100 a new fix puts you 013°T, 2.2 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1415 your fix is 260°T, 2.2 nm from Tern Island tower. You steer 146°T at 6.8 kn through the water. At 1455 a new fix puts you 210°T, 2.5 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1055 your fix is 265°T, 2.2 nm from Tern Island tower. You steer 176°T at 5.4 kn through the water. At 1130 a new fix puts you 354°T, 2.1 nm from Mill stack.

   Plot the 1130 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 1540 your fix is 056°T, 2.3 nm from Heron Point Light. You steer 089°T at 8.6 kn through the water. At 1625 a new fix puts you 331°T, 1.4 nm from Kittle water tank.

   Plot the 1625 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 0745 your fix is 019°T, 1.4 nm from Heron Point Light. You steer 097°T at 7.8 kn through the water. At 0815 a new fix puts you 024°T, 2.5 nm from Mill stack.

   Plot the 0815 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 1225 your fix is 022°T, 2.0 nm from Mill stack. You steer 350°T at 7.6 kn through the water. At 1315 a new fix puts you 294°T, 4.1 nm from Tern Island tower.

   Plot the 1315 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