Worksheet 336 · Skill 5

Set and drift

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1. At 0855 your fix is 333°T, 2.3 nm from Mill stack. You steer 318°T at 4.6 kn through the water. At 1010 a new fix puts you 101°T, 2.5 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1510 your fix is 010°T, 1.7 nm from Westfield church spire. You steer 080°T at 7.7 kn through the water. At 1550 a new fix puts you 332°T, 2.0 nm from Tern Island tower.

   Plot the 1550 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  

3. At 0935 your fix is 039°T, 4.7 nm from Gannet Rock daybeacon. You steer 226°T at 5.0 kn through the water. At 1045 a new fix puts you 137°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1045 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  

4. At 0820 your fix is 169°T, 1.3 nm from Westfield church spire. You steer 090°T at 8.5 kn through the water. At 0915 a new fix puts you 184°T, 1.6 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1205 your fix is 071°T, 4.2 nm from Tern Island tower. You steer 177°T at 4.8 kn through the water. At 1240 a new fix puts you 056°T, 2.3 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1535 your fix is 262°T, 2.6 nm from Tern Island tower. You steer 194°T at 6.1 kn through the water. At 1610 a new fix puts you 061°T, 2.3 nm from Heron Point Light.

   Plot the 1610 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 1315 your fix is 041°T, 3.6 nm from Gannet Rock daybeacon. You steer 182°T at 4.0 kn through the water. At 1350 a new fix puts you 091°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1350 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  

8. At 0815 your fix is 325°T, 1.6 nm from Tern Island tower. You steer 258°T at 4.2 kn through the water. At 0935 a new fix puts you 048°T, 4.3 nm from Westfield church spire.

   Plot the 0935 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