Worksheet 135 · Skill 5

Set and drift

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1. At 1535 your fix is 040°T, 3.2 nm from Westfield church spire. You steer 140°T at 4.4 kn through the water. At 1640 a new fix puts you 055°T, 3.3 nm from Heron Point Light.

   Plot the 1640 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 0725 your fix is 278°T, 1.4 nm from Gannet Rock daybeacon. You steer 297°T at 7.2 kn through the water. At 0835 a new fix puts you 028°T, 1.3 nm from Westfield church spire.

   Plot the 0835 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1100 your fix is 306°T, 1.3 nm from Tern Island tower. You steer 223°T at 8.3 kn through the water. At 1135 a new fix puts you 064°T, 2.4 nm from Heron Point Light.

   Plot the 1135 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 1330 your fix is 254°T, 2.1 nm from Gannet Rock daybeacon. You steer 331°T at 7.2 kn through the water. At 1405 a new fix puts you 246°T, 1.7 nm from Tern Island tower.

   Plot the 1405 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  

5. At 0810 your fix is 236°T, 1.2 nm from Gannet Rock daybeacon. You steer 252°T at 4.0 kn through the water. At 0900 a new fix puts you 065°T, 2.5 nm from Heron Point Light.

   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  

6. At 0740 your fix is 056°T, 2.8 nm from Tern Island tower. You steer 152°T at 4.5 kn through the water. At 0820 a new fix puts you 016°T, 2.0 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1325 your fix is 002°T, 2.3 nm from Westfield church spire. You steer 143°T at 4.3 kn through the water. At 1420 a new fix puts you 067°T, 1.1 nm from Westfield church spire.

   Plot the 1420 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  

8. At 1130 your fix is 040°T, 1.4 nm from Tern Island tower. You steer 269°T at 8.4 kn through the water. At 1210 a new fix puts you 302°T, 4.5 nm from Tern Island tower.

   Plot the 1210 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