Worksheet 215 · Skill 5

Set and drift

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1. At 1515 your fix is 065°T, 3.9 nm from Tern Island tower. You steer 170°T at 6.6 kn through the water. At 1550 a new fix puts you 095°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1550 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 1355 your fix is 247°T, 3.1 nm from Tern Island tower. You steer 226°T at 4.9 kn through the water. At 1435 a new fix puts you 015°T, 1.6 nm from Heron Point Light.

   Plot the 1435 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 0750 your fix is 034°T, 2.2 nm from Westfield church spire. You steer 121°T at 6.1 kn through the water. At 0830 a new fix puts you 209°T, 2.7 nm from Tern Island tower.

   Plot the 0830 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  

4. At 1430 your fix is 034°T, 3.9 nm from Westfield church spire. You steer 193°T at 4.7 kn through the water. At 1520 a new fix puts you 025°T, 1.4 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0705 your fix is 062°T, 2.4 nm from Tern Island tower. You steer 201°T at 5.3 kn through the water. At 0800 a new fix puts you 208°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 0800 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 1430 your fix is 076°T, 2.2 nm from Tern Island tower. You steer 069°T at 4.3 kn through the water. At 1500 a new fix puts you 063°T, 3.6 nm from Tern Island tower.

   Plot the 1500 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 0855 your fix is 056°T, 2.4 nm from Heron Point Light. You steer 291°T at 4.6 kn through the water. At 0930 a new fix puts you 116°T, 1.5 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1055 your fix is 264°T, 2.8 nm from Tern Island tower. You steer 278°T at 4.1 kn through the water. At 1145 a new fix puts you 075°T, 3.0 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn