Worksheet 719 · Skill 5

Set and drift

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1. At 0930 your fix is 238°T, 3.0 nm from Tern Island tower. You steer 317°T at 6.2 kn through the water. At 1010 a new fix puts you 049°T, 3.6 nm from Westfield church spire.

   Plot the 1010 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 1110 your fix is 038°T, 2.8 nm from Tern Island tower. You steer 254°T at 8.1 kn through the water. At 1200 a new fix puts you 026°T, 3.0 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0750 your fix is 332°T, 2.2 nm from Mill stack. You steer 050°T at 6.3 kn through the water. At 0830 a new fix puts you 275°T, 2.3 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0755 your fix is 034°T, 3.4 nm from Heron Point Light. You steer 026°T at 5.8 kn through the water. At 0830 a new fix puts you 320°T, 2.8 nm from Tern Island tower.

   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  

5. At 0955 your fix is 275°T, 3.5 nm from Tern Island tower. You steer 124°T at 5.3 kn through the water. At 1120 a new fix puts you 034°T, 1.9 nm from Mill stack.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0725 your fix is 312°T, 2.2 nm from Tern Island tower. You steer 216°T at 8.0 kn through the water. At 0800 a new fix puts you 035°T, 2.2 nm from Heron Point Light.

   Plot the 0800 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 1020 your fix is 041°T, 3.4 nm from Heron Point Light. You steer 313°T at 5.1 kn through the water. At 1110 a new fix puts you 011°T, 2.5 nm from Westfield church spire.

   Plot the 1110 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  

8. At 0925 your fix is 064°T, 2.0 nm from Tern Island tower. You steer 134°T at 5.9 kn through the water. At 0955 a new fix puts you 054°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0955 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