Worksheet 328 · Skill 5

Set and drift

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1. At 0720 your fix is 027°T, 2.2 nm from Kittle water tank. You steer 268°T at 8.3 kn through the water. At 0810 a new fix puts you 057°T, 3.3 nm from Heron Point Light.

   Plot the 0810 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  

2. At 1025 your fix is 357°T, 1.5 nm from Heron Point Light. You steer 349°T at 4.8 kn through the water. At 1130 a new fix puts you 003°T, 2.5 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1125 your fix is 308°T, 1.9 nm from Tern Island tower. You steer 197°T at 6.6 kn through the water. At 1220 a new fix puts you 347°T, 2.7 nm from Mill stack.

   Plot the 1220 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  

4. At 1235 your fix is 343°T, 2.3 nm from Mill stack. You steer 318°T at 4.6 kn through the water. At 1305 a new fix puts you 041°T, 1.8 nm from Heron Point Light.

   Plot the 1305 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 1315 your fix is 214°T, 1.5 nm from Gannet Rock daybeacon. You steer 321°T at 5.3 kn through the water. At 1410 a new fix puts you 283°T, 3.6 nm from Tern Island tower.

   Plot the 1410 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  

6. At 1535 your fix is 209°T, 3.0 nm from Tern Island tower. You steer 133°T at 4.8 kn through the water. At 1610 a new fix puts you 200°T, 2.2 nm from Gannet Rock daybeacon.

   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 1140 your fix is 358°T, 3.0 nm from Mill stack. You steer 308°T at 5.2 kn through the water. At 1220 a new fix puts you 269°T, 3.5 nm from Tern Island tower.

   Plot the 1220 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  

8. At 1410 your fix is 068°T, 1.7 nm from Heron Point Light. You steer 062°T at 5.3 kn through the water. At 1525 a new fix puts you 028°T, 2.1 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn