Worksheet 646 · Skill 5

Set and drift

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1. At 0805 your fix is 100°T, 2.4 nm from Westfield church spire. You steer 080°T at 5.7 kn through the water. At 0835 a new fix puts you 263°T, 2.9 nm from Tern Island tower.

   Plot the 0835 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 1545 your fix is 280°T, 3.8 nm from Tern Island tower. You steer 081°T at 8.1 kn through the water. At 1635 a new fix puts you 052°T, 3.9 nm from Tern Island tower.

   Plot the 1635 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 1355 your fix is 057°T, 1.6 nm from Gannet Rock daybeacon. You steer 256°T at 5.2 kn through the water. At 1520 a new fix puts you 345°T, 1.2 nm from Heron Point Light.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1220 your fix is 317°T, 1.5 nm from Kittle water tank. You steer 319°T at 5.4 kn through the water. At 1320 a new fix puts you 245°T, 1.8 nm from Tern Island tower.

   Plot the 1320 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  

5. At 0710 your fix is 255°T, 1.7 nm from Gannet Rock daybeacon. You steer 280°T at 7.3 kn through the water. At 0740 a new fix puts you 350°T, 3.4 nm from Mill stack.

   Plot the 0740 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 0905 your fix is 038°T, 3.8 nm from Gannet Rock daybeacon. You steer 203°T at 6.8 kn through the water. At 0935 a new fix puts you 136°T, 3.2 nm from Tern Island tower.

   Plot the 0935 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 1000 your fix is 297°T, 3.4 nm from Tern Island tower. You steer 170°T at 7.6 kn through the water. At 1040 a new fix puts you 344°T, 2.9 nm from Mill stack.

   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  

8. At 1430 your fix is 298°T, 3.7 nm from Tern Island tower. You steer 101°T at 5.0 kn through the water. At 1500 a new fix puts you 344°T, 2.3 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn