Worksheet 11 · Skill 5

Set and drift

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1. At 1040 your fix is 208°T, 1.4 nm from Gannet Rock daybeacon. You steer 007°T at 5.9 kn through the water. At 1135 a new fix puts you 063°T, 2.2 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0920 your fix is 062°T, 3.1 nm from Westfield church spire. You steer 123°T at 8.2 kn through the water. At 1000 a new fix puts you 267°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1000 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 1055 your fix is 301°T, 2.0 nm from Kittle water tank. You steer 321°T at 7.1 kn through the water. At 1140 a new fix puts you 275°T, 2.1 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1010 your fix is 272°T, 1.9 nm from Tern Island tower. You steer 190°T at 6.1 kn through the water. At 1050 a new fix puts you 318°T, 1.5 nm from Mill stack.

   Plot the 1050 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 0815 your fix is 022°T, 1.9 nm from Mill stack. You steer 307°T at 4.7 kn through the water. At 0910 a new fix puts you 031°T, 1.9 nm from Heron Point Light.

   Plot the 0910 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  

6. At 0940 your fix is 293°T, 2.6 nm from Tern Island tower. You steer 151°T at 6.3 kn through the water. At 1025 a new fix puts you 206°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1025 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 1500 your fix is 083°T, 1.0 nm from Westfield church spire. You steer 068°T at 8.7 kn through the water. At 1545 a new fix puts you 325°T, 2.9 nm from Tern Island tower.

   Plot the 1545 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 1345 your fix is 232°T, 2.3 nm from Tern Island tower. You steer 294°T at 7.4 kn through the water. At 1420 a new fix puts you 027°T, 1.0 nm from Westfield church spire.

   Plot the 1420 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