Worksheet 543 · Skill 5

Set and drift

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1. At 0810 your fix is 051°T, 2.0 nm from Tern Island tower. You steer 097°T at 4.4 kn through the water. At 0845 a new fix puts you 038°T, 3.9 nm from Gannet Rock daybeacon.

   Plot the 0845 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 0755 your fix is 025°T, 2.5 nm from Westfield church spire. You steer 173°T at 5.7 kn through the water. At 0830 a new fix puts you 342°T, 1.8 nm from Heron Point Light.

   Plot the 0830 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 0735 your fix is 029°T, 3.6 nm from Heron Point Light. You steer 259°T at 5.1 kn through the water. At 0805 a new fix puts you 142°T, 1.4 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0800 your fix is 068°T, 2.8 nm from Heron Point Light. You steer 000°T at 4.3 kn through the water. At 0915 a new fix puts you 293°T, 3.6 nm from Tern Island tower.

   Plot the 0915 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 1200 your fix is 267°T, 3.7 nm from Tern Island tower. You steer 138°T at 4.5 kn through the water. At 1240 a new fix puts you 208°T, 3.1 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0910 your fix is 201°T, 1.0 nm from Gannet Rock daybeacon. You steer 260°T at 8.9 kn through the water. At 0945 a new fix puts you 307°T, 2.0 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1010 your fix is 298°T, 4.1 nm from Tern Island tower. You steer 205°T at 5.5 kn through the water. At 1040 a new fix puts you 085°T, 2.7 nm from Westfield church spire.

   Plot the 1040 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 1020 your fix is 045°T, 3.5 nm from Heron Point Light. You steer 112°T at 6.0 kn through the water. At 1115 a new fix puts you 042°T, 1.2 nm from Kittle water tank.

   Plot the 1115 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn