Worksheet 449 · Skill 5

Set and drift

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1. At 1050 your fix is 325°T, 3.0 nm from Kittle water tank. You steer 292°T at 5.1 kn through the water. At 1205 a new fix puts you 063°T, 1.7 nm from Westfield church spire.

   Plot the 1205 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  

2. At 0815 your fix is 041°T, 4.1 nm from Westfield church spire. You steer 166°T at 6.1 kn through the water. At 0905 a new fix puts you 058°T, 3.4 nm from Heron Point Light.

   Plot the 0905 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  

3. At 0915 your fix is 353°T, 1.5 nm from Heron Point Light. You steer 085°T at 8.4 kn through the water. At 1000 a new fix puts you 023°T, 2.7 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0705 your fix is 299°T, 3.3 nm from Tern Island tower. You steer 240°T at 7.1 kn through the water. At 0735 a new fix puts you 037°T, 1.8 nm from Westfield church spire.

   Plot the 0735 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 1200 your fix is 015°T, 3.3 nm from Westfield church spire. You steer 120°T at 6.1 kn through the water. At 1315 a new fix puts you 300°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1315 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 0755 your fix is 024°T, 2.8 nm from Westfield church spire. You steer 169°T at 4.6 kn through the water. At 0825 a new fix puts you 060°T, 1.7 nm from Westfield church spire.

   Plot the 0825 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 1150 your fix is 037°T, 1.4 nm from Kittle water tank. You steer 298°T at 8.3 kn through the water. At 1220 a new fix puts you 252°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1220 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 1215 your fix is 185°T, 1.0 nm from Gannet Rock daybeacon. You steer 292°T at 6.1 kn through the water. At 1335 a new fix puts you 118°T, 1.4 nm from Westfield church spire.

   Plot the 1335 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn