Worksheet 833 · Skill 5

Set and drift

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1. At 0930 your fix is 059°T, 3.4 nm from Westfield church spire. You steer 146°T at 5.9 kn through the water. At 1030 a new fix puts you 060°T, 2.6 nm from Mill stack.

   Plot the 1030 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1455 your fix is 283°T, 1.4 nm from Gannet Rock daybeacon. You steer 061°T at 5.1 kn through the water. At 1525 a new fix puts you 043°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1525 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  

3. At 1145 your fix is 144°T, 2.6 nm from Tern Island tower. You steer 281°T at 4.7 kn through the water. At 1225 a new fix puts you 058°T, 3.4 nm from Heron Point Light.

   Plot the 1225 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 0945 your fix is 228°T, 2.6 nm from Tern Island tower. You steer 079°T at 5.1 kn through the water. At 1105 a new fix puts you 060°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1105 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  

5. At 0820 your fix is 162°T, 1.6 nm from Tern Island tower. You steer 179°T at 7.1 kn through the water. At 0850 a new fix puts you 219°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 0850 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  

6. At 1415 your fix is 214°T, 1.7 nm from Tern Island tower. You steer 115°T at 4.3 kn through the water. At 1445 a new fix puts you 156°T, 3.2 nm from Tern Island tower.

   Plot the 1445 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 1255 your fix is 258°T, 2.2 nm from Gannet Rock daybeacon. You steer 050°T at 6.7 kn through the water. At 1355 a new fix puts you 046°T, 4.4 nm from Gannet Rock daybeacon.

   Plot the 1355 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1050 your fix is 208°T, 1.5 nm from Tern Island tower. You steer 286°T at 8.7 kn through the water. At 1125 a new fix puts you 067°T, 2.7 nm from Westfield church spire.

   Plot the 1125 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