Worksheet 252 · Skill 5

Set and drift

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1. At 1025 your fix is 248°T, 3.4 nm from Tern Island tower. You steer 192°T at 7.3 kn through the water. At 1055 a new fix puts you 329°T, 1.7 nm from Mill stack.

   Plot the 1055 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  

2. At 1410 your fix is 254°T, 1.9 nm from Tern Island tower. You steer 197°T at 4.5 kn through the water. At 1440 a new fix puts you 063°T, 2.8 nm from Heron Point Light.

   Plot the 1440 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 1020 your fix is 187°T, 1.3 nm from Gannet Rock daybeacon. You steer 251°T at 6.8 kn through the water. At 1055 a new fix puts you 307°T, 1.7 nm from Mill stack.

   Plot the 1055 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  

4. At 0955 your fix is 141°T, 2.6 nm from Tern Island tower. You steer 045°T at 4.7 kn through the water. At 1035 a new fix puts you 054°T, 3.7 nm from Gannet Rock daybeacon.

   Plot the 1035 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 1115 your fix is 278°T, 2.9 nm from Tern Island tower. You steer 215°T at 5.3 kn through the water. At 1145 a new fix puts you 027°T, 2.9 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1500 your fix is 276°T, 2.8 nm from Tern Island tower. You steer 257°T at 7.0 kn through the water. At 1530 a new fix puts you 063°T, 2.0 nm from Westfield church spire.

   Plot the 1530 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 1545 your fix is 114°T, 2.1 nm from Gannet Rock daybeacon. You steer 259°T at 5.4 kn through the water. At 1625 a new fix puts you 195°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1625 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 1445 your fix is 039°T, 4.6 nm from Westfield church spire. You steer 179°T at 4.3 kn through the water. At 1535 a new fix puts you 268°T, 3.1 nm from Tern Island tower.

   Plot the 1535 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