Worksheet 19 · Skill 5

Set and drift

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1. At 1445 your fix is 100°T, 1.9 nm from Gannet Rock daybeacon. You steer 249°T at 7.3 kn through the water. At 1520 a new fix puts you 235°T, 1.7 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1115 your fix is 070°T, 4.6 nm from Tern Island tower. You steer 280°T at 6.5 kn through the water. At 1200 a new fix puts you 340°T, 1.5 nm from Tern Island tower.

   Plot the 1200 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 1245 your fix is 250°T, 2.6 nm from Gannet Rock daybeacon. You steer 049°T at 5.0 kn through the water. At 1415 a new fix puts you 062°T, 5.4 nm from Tern Island tower.

   Plot the 1415 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0830 your fix is 064°T, 2.7 nm from Westfield church spire. You steer 072°T at 7.5 kn through the water. At 0900 a new fix puts you 333°T, 2.4 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1235 your fix is 033°T, 2.1 nm from Mill stack. You steer 068°T at 7.6 kn through the water. At 1305 a new fix puts you 333°T, 2.5 nm from Kittle water tank.

   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  

6. At 0835 your fix is 010°T, 3.2 nm from Westfield church spire. You steer 150°T at 4.0 kn through the water. At 0915 a new fix puts you 073°T, 1.7 nm from Westfield church spire.

   Plot the 0915 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 1440 your fix is 113°T, 1.7 nm from Westfield church spire. You steer 113°T at 5.1 kn through the water. At 1530 a new fix puts you 002°T, 1.9 nm from Mill stack.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1330 your fix is 291°T, 2.2 nm from Tern Island tower. You steer 166°T at 4.5 kn through the water. At 1400 a new fix puts you 217°T, 1.9 nm from Tern Island tower.

   Plot the 1400 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