Worksheet 174 · Skill 5

Set and drift

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1. At 0905 your fix is 340°T, 1.2 nm from Gannet Rock daybeacon. You steer 230°T at 5.1 kn through the water. At 0945 a new fix puts you 022°T, 2.5 nm from Mill stack.

   Plot the 0945 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  

2. At 0730 your fix is 118°T, 1.1 nm from Westfield church spire. You steer 127°T at 4.7 kn through the water. At 0805 a new fix puts you 028°T, 1.9 nm from Heron Point Light.

   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  

3. At 1335 your fix is 277°T, 1.1 nm from Gannet Rock daybeacon. You steer 266°T at 5.0 kn through the water. At 1450 a new fix puts you 037°T, 1.5 nm from Heron Point Light.

   Plot the 1450 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  

4. At 1450 your fix is 064°T, 5.2 nm from Tern Island tower. You steer 205°T at 6.7 kn through the water. At 1535 a new fix puts you 075°T, 1.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1150 your fix is 279°T, 1.4 nm from Gannet Rock daybeacon. You steer 213°T at 4.0 kn through the water. At 1240 a new fix puts you 355°T, 1.0 nm from Mill stack.

   Plot the 1240 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  

6. At 1520 your fix is 284°T, 3.1 nm from Tern Island tower. You steer 221°T at 7.9 kn through the water. At 1555 a new fix puts you 143°T, 1.7 nm from Westfield church spire.

   Plot the 1555 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 1215 your fix is 347°T, 1.4 nm from Heron Point Light. You steer 068°T at 6.7 kn through the water. At 1245 a new fix puts you 052°T, 3.3 nm from Heron Point Light.

   Plot the 1245 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  

8. At 0825 your fix is 036°T, 3.4 nm from Heron Point Light. You steer 324°T at 6.3 kn through the water. At 0900 a new fix puts you 036°T, 4.4 nm from Westfield church spire.

   Plot the 0900 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