Worksheet 358 · Skill 5

Set and drift

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1. At 1105 your fix is 066°T, 3.5 nm from Westfield church spire. You steer 221°T at 6.1 kn through the water. At 1140 a new fix puts you 147°T, 1.9 nm from Westfield church spire.

   Plot the 1140 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  

2. At 1145 your fix is 108°T, 1.8 nm from Westfield church spire. You steer 067°T at 5.2 kn through the water. At 1225 a new fix puts you 247°T, 3.0 nm from Tern Island tower.

   Plot the 1225 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  

3. At 0830 your fix is 025°T, 2.8 nm from Westfield church spire. You steer 124°T at 4.2 kn through the water. At 0915 a new fix puts you 269°T, 2.4 nm from Tern Island tower.

   Plot the 0915 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  

4. At 1540 your fix is 033°T, 2.4 nm from Kittle water tank. You steer 244°T at 4.8 kn through the water. At 1610 a new fix puts you 295°T, 1.4 nm from Kittle water tank.

   Plot the 1610 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 0940 your fix is 223°T, 1.8 nm from Gannet Rock daybeacon. You steer 260°T at 4.1 kn through the water. At 1045 a new fix puts you 080°T, 2.1 nm from Heron Point Light.

   Plot the 1045 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 0815 your fix is 057°T, 3.0 nm from Gannet Rock daybeacon. You steer 262°T at 5.7 kn through the water. At 0855 a new fix puts you 279°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 0855 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 0840 your fix is 213°T, 2.8 nm from Tern Island tower. You steer 267°T at 4.1 kn through the water. At 0925 a new fix puts you 102°T, 2.8 nm from Westfield church spire.

   Plot the 0925 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  

8. At 1445 your fix is 259°T, 2.3 nm from Gannet Rock daybeacon. You steer 068°T at 5.2 kn through the water. At 1535 a new fix puts you 001°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1535 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