Worksheet 402 · Skill 5

Set and drift

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1. At 0815 your fix is 334°T, 1.2 nm from Heron Point Light. You steer 359°T at 5.0 kn through the water. At 0920 a new fix puts you 009°T, 3.6 nm from Westfield church spire.

   Plot the 0920 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  

2. At 1535 your fix is 099°T, 2.1 nm from Tern Island tower. You steer 229°T at 6.1 kn through the water. At 1605 a new fix puts you 269°T, 2.5 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1525 your fix is 294°T, 3.8 nm from Tern Island tower. You steer 223°T at 5.4 kn through the water. At 1600 a new fix puts you 067°T, 1.6 nm from Westfield church spire.

   Plot the 1600 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 0810 your fix is 006°T, 2.5 nm from Westfield church spire. You steer 146°T at 7.7 kn through the water. At 0900 a new fix puts you 356°T, 2.6 nm from Mill stack.

   Plot the 0900 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 1230 your fix is 059°T, 3.3 nm from Gannet Rock daybeacon. You steer 310°T at 7.1 kn through the water. At 1300 a new fix puts you 062°T, 3.1 nm from Tern Island tower.

   Plot the 1300 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 0745 your fix is 042°T, 2.4 nm from Westfield church spire. You steer 160°T at 7.3 kn through the water. At 0820 a new fix puts you 052°T, 1.9 nm from Heron Point Light.

   Plot the 0820 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 1550 your fix is 064°T, 2.2 nm from Westfield church spire. You steer 167°T at 6.8 kn through the water. At 1625 a new fix puts you 303°T, 3.6 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0940 your fix is 335°T, 2.3 nm from Tern Island tower. You steer 260°T at 8.3 kn through the water. At 1015 a new fix puts you 050°T, 3.9 nm from Westfield church spire.

   Plot the 1015 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