Worksheet 838 · Skill 5

Set and drift

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1. At 1015 your fix is 048°T, 2.0 nm from Westfield church spire. You steer 116°T at 4.3 kn through the water. At 1120 a new fix puts you 268°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1120 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 0825 your fix is 226°T, 3.4 nm from Tern Island tower. You steer 321°T at 5.9 kn through the water. At 0925 a new fix puts you 030°T, 1.4 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0955 your fix is 019°T, 3.1 nm from Westfield church spire. You steer 114°T at 4.8 kn through the water. At 1045 a new fix puts you 302°T, 1.3 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1130 your fix is 310°T, 1.5 nm from Tern Island tower. You steer 241°T at 8.7 kn through the water. At 1200 a new fix puts you 096°T, 2.0 nm from Westfield church spire.

   Plot the 1200 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 0725 your fix is 253°T, 3.2 nm from Tern Island tower. You steer 135°T at 5.8 kn through the water. At 0805 a new fix puts you 019°T, 2.6 nm from Mill stack.

   Plot the 0805 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  

6. At 1015 your fix is 241°T, 3.4 nm from Tern Island tower. You steer 111°T at 7.8 kn through the water. At 1045 a new fix puts you 323°T, 3.0 nm from Kittle water tank.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0955 your fix is 295°T, 3.7 nm from Tern Island tower. You steer 087°T at 5.8 kn through the water. At 1105 a new fix puts you 058°T, 4.8 nm from Tern Island tower.

   Plot the 1105 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1425 your fix is 036°T, 0.9 nm from Heron Point Light. You steer 042°T at 4.9 kn through the water. At 1515 a new fix puts you 264°T, 2.6 nm from Tern Island tower.

   Plot the 1515 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