Worksheet 764 · Skill 5

Set and drift

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1. At 0800 your fix is 286°T, 2.6 nm from Tern Island tower. You steer 145°T at 7.6 kn through the water. At 0830 a new fix puts you 266°T, 1.6 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1030 your fix is 184°T, 2.0 nm from Tern Island tower. You steer 069°T at 7.8 kn through the water. At 1100 a new fix puts you 029°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1100 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 1310 your fix is 015°T, 3.7 nm from Westfield church spire. You steer 100°T at 7.5 kn through the water. At 1405 a new fix puts you 009°T, 2.1 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1155 your fix is 064°T, 3.6 nm from Westfield church spire. You steer 204°T at 6.1 kn through the water. At 1225 a new fix puts you 105°T, 2.5 nm from Westfield church spire.

   Plot the 1225 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 1115 your fix is 264°T, 2.8 nm from Tern Island tower. You steer 221°T at 6.1 kn through the water. At 1145 a new fix puts you 096°T, 2.4 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1540 your fix is 056°T, 2.6 nm from Gannet Rock daybeacon. You steer 279°T at 4.1 kn through the water. At 1615 a new fix puts you 078°T, 1.4 nm from Tern Island tower.

   Plot the 1615 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 0945 your fix is 304°T, 2.6 nm from Tern Island tower. You steer 160°T at 4.6 kn through the water. At 1055 a new fix puts you 256°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1055 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  

8. At 0800 your fix is 291°T, 1.7 nm from Gannet Rock daybeacon. You steer 293°T at 5.8 kn through the water. At 0900 a new fix puts you 064°T, 1.9 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn