Worksheet 682 · Skill 5

Set and drift

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1. At 1240 your fix is 226°T, 1.6 nm from Tern Island tower. You steer 104°T at 5.1 kn through the water. At 1330 a new fix puts you 080°T, 1.9 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1330 your fix is 070°T, 2.4 nm from Westfield church spire. You steer 123°T at 4.8 kn through the water. At 1405 a new fix puts you 235°T, 2.7 nm from Tern Island tower.

   Plot the 1405 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  

3. At 1505 your fix is 029°T, 2.0 nm from Kittle water tank. You steer 339°T at 8.8 kn through the water. At 1545 a new fix puts you 060°T, 2.7 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0915 your fix is 003°T, 2.1 nm from Westfield church spire. You steer 118°T at 6.7 kn through the water. At 0950 a new fix puts you 269°T, 3.4 nm from Tern Island tower.

   Plot the 0950 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  

5. At 1110 your fix is 046°T, 4.1 nm from Gannet Rock daybeacon. You steer 282°T at 5.4 kn through the water. At 1225 a new fix puts you 024°T, 2.8 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0730 your fix is 001°T, 2.5 nm from Westfield church spire. You steer 131°T at 5.9 kn through the water. At 0835 a new fix puts you 256°T, 3.4 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1100 your fix is 113°T, 2.1 nm from Gannet Rock daybeacon. You steer 253°T at 8.3 kn through the water. At 1145 a new fix puts you 321°T, 1.6 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1450 your fix is 333°T, 2.6 nm from Kittle water tank. You steer 250°T at 8.9 kn through the water. At 1525 a new fix puts you 337°T, 2.0 nm from Mill stack.

   Plot the 1525 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