Worksheet 78 · Skill 5

Set and drift

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1. At 1135 your fix is 261°T, 1.1 nm from Gannet Rock daybeacon. You steer 285°T at 4.5 kn through the water. At 1220 a new fix puts you 056°T, 2.6 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1030 your fix is 263°T, 2.9 nm from Tern Island tower. You steer 234°T at 5.1 kn through the water. At 1115 a new fix puts you 335°T, 1.7 nm from Heron Point Light.

   Plot the 1115 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1505 your fix is 007°T, 1.1 nm from Westfield church spire. You steer 113°T at 7.7 kn through the water. At 1605 a new fix puts you 201°T, 0.8 nm from Gannet Rock daybeacon.

   Plot the 1605 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  

4. At 1440 your fix is 041°T, 3.1 nm from Westfield church spire. You steer 128°T at 5.6 kn through the water. At 1525 a new fix puts you 256°T, 3.7 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1045 your fix is 152°T, 2.5 nm from Tern Island tower. You steer 034°T at 7.0 kn through the water. At 1120 a new fix puts you 063°T, 2.5 nm from Tern Island tower.

   Plot the 1120 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 1045 your fix is 056°T, 2.5 nm from Heron Point Light. You steer 030°T at 4.4 kn through the water. At 1125 a new fix puts you 268°T, 2.1 nm from Tern Island tower.

   Plot the 1125 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  

7. At 0825 your fix is 093°T, 3.6 nm from Westfield church spire. You steer 113°T at 6.3 kn through the water. At 0930 a new fix puts you 083°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 0930 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  

8. At 0840 your fix is 265°T, 3.6 nm from Tern Island tower. You steer 106°T at 6.6 kn through the water. At 0930 a new fix puts you 233°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0930 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