Worksheet 649 · Skill 5

Set and drift

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1. At 0755 your fix is 334°T, 2.5 nm from Kittle water tank. You steer 270°T at 7.8 kn through the water. At 0850 a new fix puts you 033°T, 2.8 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1340 your fix is 296°T, 1.7 nm from Gannet Rock daybeacon. You steer 235°T at 6.6 kn through the water. At 1420 a new fix puts you 338°T, 2.5 nm from Mill stack.

   Plot the 1420 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 0725 your fix is 059°T, 2.9 nm from Gannet Rock daybeacon. You steer 286°T at 4.1 kn through the water. At 0755 a new fix puts you 037°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 0755 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 1440 your fix is 323°T, 1.5 nm from Gannet Rock daybeacon. You steer 270°T at 7.8 kn through the water. At 1510 a new fix puts you 044°T, 3.4 nm from Heron Point Light.

   Plot the 1510 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  

5. At 1445 your fix is 305°T, 4.2 nm from Tern Island tower. You steer 171°T at 6.8 kn through the water. At 1545 a new fix puts you 026°T, 2.1 nm from Mill stack.

   Plot the 1545 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  

6. At 1050 your fix is 026°T, 1.5 nm from Heron Point Light. You steer 042°T at 4.8 kn through the water. At 1145 a new fix puts you 280°T, 3.6 nm from Tern Island tower.

   Plot the 1145 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  

7. At 1545 your fix is 270°T, 2.8 nm from Tern Island tower. You steer 144°T at 4.0 kn through the water. At 1615 a new fix puts you 240°T, 2.6 nm from Tern Island tower.

   Plot the 1615 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 0850 your fix is 251°T, 3.0 nm from Tern Island tower. You steer 041°T at 4.0 kn through the water. At 0940 a new fix puts you 298°T, 2.2 nm from Tern Island tower.

   Plot the 0940 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