Worksheet 28 · Skill 5

Set and drift

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1. At 1245 your fix is 266°T, 1.7 nm from Tern Island tower. You steer 143°T at 4.8 kn through the water. At 1330 a new fix puts you 236°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1330 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 0920 your fix is 224°T, 1.5 nm from Gannet Rock daybeacon. You steer 320°T at 5.3 kn through the water. At 1015 a new fix puts you 291°T, 3.9 nm from Tern Island tower.

   Plot the 1015 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  

3. At 0725 your fix is 288°T, 1.1 nm from Gannet Rock daybeacon. You steer 277°T at 5.7 kn through the water. At 0830 a new fix puts you 072°T, 2.7 nm from Westfield church spire.

   Plot the 0830 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  

4. At 1505 your fix is 108°T, 2.0 nm from Westfield church spire. You steer 100°T at 6.0 kn through the water. At 1615 a new fix puts you 273°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1615 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1115 your fix is 339°T, 2.3 nm from Mill stack. You steer 079°T at 4.2 kn through the water. At 1145 a new fix puts you 011°T, 2.4 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1520 your fix is 043°T, 3.1 nm from Heron Point Light. You steer 264°T at 5.9 kn through the water. At 1600 a new fix puts you 159°T, 1.4 nm from Westfield church spire.

   Plot the 1600 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  

7. At 1410 your fix is 084°T, 2.3 nm from Westfield church spire. You steer 097°T at 5.9 kn through the water. At 1500 a new fix puts you 188°T, 1.9 nm from Tern Island tower.

   Plot the 1500 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  

8. At 0805 your fix is 081°T, 2.4 nm from Tern Island tower. You steer 201°T at 4.4 kn through the water. At 0850 a new fix puts you 256°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 0850 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