Worksheet 234 · Skill 5

Set and drift

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1. At 0905 your fix is 041°T, 3.2 nm from Westfield church spire. You steer 102°T at 6.0 kn through the water. At 0940 a new fix puts you 286°T, 2.6 nm from Tern Island tower.

   Plot the 0940 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 1410 your fix is 334°T, 1.1 nm from Heron Point Light. You steer 036°T at 4.7 kn through the water. At 1520 a new fix puts you 322°T, 1.5 nm from Tern Island tower.

   Plot the 1520 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  

3. At 0730 your fix is 221°T, 3.4 nm from Tern Island tower. You steer 005°T at 5.1 kn through the water. At 0805 a new fix puts you 317°T, 2.4 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1325 your fix is 058°T, 0.9 nm from Heron Point Light. You steer 337°T at 4.9 kn through the water. At 1440 a new fix puts you 060°T, 2.5 nm from Westfield church spire.

   Plot the 1440 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  

5. At 1545 your fix is 007°T, 2.0 nm from Tern Island tower. You steer 148°T at 4.4 kn through the water. At 1615 a new fix puts you 071°T, 1.9 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1000 your fix is 041°T, 4.4 nm from Gannet Rock daybeacon. You steer 274°T at 4.6 kn through the water. At 1035 a new fix puts you 075°T, 1.9 nm from Tern Island tower.

   Plot the 1035 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  

7. At 0950 your fix is 081°T, 2.1 nm from Heron Point Light. You steer 067°T at 4.0 kn through the water. At 1030 a new fix puts you 242°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1030 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  

8. At 1110 your fix is 261°T, 3.6 nm from Tern Island tower. You steer 147°T at 8.1 kn through the water. At 1145 a new fix puts you 036°T, 1.0 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn