Worksheet 66 · Skill 5

Set and drift

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1. At 0720 your fix is 218°T, 2.2 nm from Gannet Rock daybeacon. You steer 328°T at 6.1 kn through the water. At 0755 a new fix puts you 246°T, 2.8 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1055 your fix is 232°T, 2.1 nm from Tern Island tower. You steer 103°T at 4.5 kn through the water. At 1130 a new fix puts you 314°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1130 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 1425 your fix is 028°T, 3.0 nm from Westfield church spire. You steer 150°T at 4.8 kn through the water. At 1555 a new fix puts you 080°T, 2.3 nm from Heron Point Light.

   Plot the 1555 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1505 your fix is 007°T, 2.1 nm from Westfield church spire. You steer 137°T at 8.0 kn through the water. At 1545 a new fix puts you 077°T, 1.7 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1535 your fix is 347°T, 1.7 nm from Heron Point Light. You steer 350°T at 7.1 kn through the water. At 1615 a new fix puts you 035°T, 2.6 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1410 your fix is 057°T, 2.2 nm from Heron Point Light. You steer 027°T at 6.4 kn through the water. At 1445 a new fix puts you 279°T, 3.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1400 your fix is 059°T, 1.7 nm from Gannet Rock daybeacon. You steer 024°T at 4.7 kn through the water. At 1450 a new fix puts you 036°T, 4.4 nm from Gannet Rock daybeacon.

   Plot the 1450 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 1425 your fix is 262°T, 1.7 nm from Gannet Rock daybeacon. You steer 286°T at 4.3 kn through the water. At 1520 a new fix puts you 091°T, 3.4 nm from Westfield church spire.

   Plot the 1520 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