Worksheet 596 · Skill 5

Set and drift

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1. At 0840 your fix is 192°T, 1.8 nm from Gannet Rock daybeacon. You steer 277°T at 4.0 kn through the water. At 0945 a new fix puts you 085°T, 1.9 nm from Heron Point Light.

   Plot the 0945 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  

2. At 1235 your fix is 068°T, 1.8 nm from Tern Island tower. You steer 296°T at 6.2 kn through the water. At 1305 a new fix puts you 328°T, 2.6 nm from Tern Island tower.

   Plot the 1305 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  

3. At 1055 your fix is 020°T, 3.5 nm from Westfield church spire. You steer 129°T at 4.9 kn through the water. At 1150 a new fix puts you 047°T, 3.2 nm from Heron Point Light.

   Plot the 1150 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  

4. At 0925 your fix is 248°T, 3.1 nm from Tern Island tower. You steer 197°T at 5.0 kn through the water. At 0955 a new fix puts you 051°T, 2.0 nm from Heron Point Light.

   Plot the 0955 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 0935 your fix is 323°T, 2.6 nm from Tern Island tower. You steer 206°T at 5.5 kn through the water. At 1040 a new fix puts you 025°T, 2.3 nm from Heron Point Light.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1555 your fix is 031°T, 3.9 nm from Gannet Rock daybeacon. You steer 231°T at 6.1 kn through the water. At 1715 a new fix puts you 079°T, 1.9 nm from Heron Point Light.

   Plot the 1715 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0840 your fix is 011°T, 1.9 nm from Mill stack. You steer 309°T at 7.8 kn through the water. At 0935 a new fix puts you 006°T, 2.4 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1540 your fix is 248°T, 3.3 nm from Tern Island tower. You steer 015°T at 5.3 kn through the water. At 1615 a new fix puts you 316°T, 1.7 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn