Worksheet 149 · Skill 5

Set and drift

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1. At 0850 your fix is 093°T, 1.8 nm from Westfield church spire. You steer 121°T at 4.6 kn through the water. At 1005 a new fix puts you 212°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1005 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 0730 your fix is 044°T, 4.4 nm from Westfield church spire. You steer 135°T at 4.6 kn through the water. At 0805 a new fix puts you 292°T, 2.9 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  

3. At 1245 your fix is 311°T, 1.3 nm from Gannet Rock daybeacon. You steer 183°T at 4.2 kn through the water. At 1315 a new fix puts you 211°T, 2.4 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0810 your fix is 287°T, 2.9 nm from Tern Island tower. You steer 249°T at 5.3 kn through the water. At 0855 a new fix puts you 008°T, 1.2 nm from Westfield church spire.

   Plot the 0855 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 1310 your fix is 213°T, 2.1 nm from Tern Island tower. You steer 290°T at 4.4 kn through the water. At 1400 a new fix puts you 029°T, 3.7 nm from Heron Point Light.

   Plot the 1400 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 0910 your fix is 110°T, 1.3 nm from Westfield church spire. You steer 026°T at 4.1 kn through the water. At 0955 a new fix puts you 044°T, 3.2 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0835 your fix is 024°T, 1.7 nm from Heron Point Light. You steer 035°T at 4.7 kn through the water. At 0945 a new fix puts you 273°T, 3.8 nm from Tern Island tower.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0800 your fix is 071°T, 1.2 nm from Heron Point Light. You steer 350°T at 4.1 kn through the water. At 0845 a new fix puts you 051°T, 2.5 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn