Worksheet 593 · Skill 5

Set and drift

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1. At 1350 your fix is 260°T, 2.5 nm from Tern Island tower. You steer 142°T at 8.8 kn through the water. At 1420 a new fix puts you 212°T, 1.1 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1530 your fix is 061°T, 3.4 nm from Tern Island tower. You steer 271°T at 4.2 kn through the water. At 1645 a new fix puts you 005°T, 2.1 nm from Tern Island tower.

   Plot the 1645 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0755 your fix is 191°T, 1.1 nm from Gannet Rock daybeacon. You steer 055°T at 6.5 kn through the water. At 0830 a new fix puts you 079°T, 2.9 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1355 your fix is 033°T, 3.7 nm from Gannet Rock daybeacon. You steer 278°T at 7.8 kn through the water. At 1500 a new fix puts you 311°T, 2.4 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1420 your fix is 038°T, 1.3 nm from Gannet Rock daybeacon. You steer 157°T at 4.4 kn through the water. At 1505 a new fix puts you 046°T, 0.9 nm from Kittle water tank.

   Plot the 1505 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  

6. At 1315 your fix is 069°T, 3.6 nm from Westfield church spire. You steer 121°T at 6.9 kn through the water. At 1400 a new fix puts you 261°T, 1.8 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1025 your fix is 009°T, 3.4 nm from Westfield church spire. You steer 130°T at 4.2 kn through the water. At 1150 a new fix puts you 258°T, 1.4 nm from Tern Island tower.

   Plot the 1150 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1405 your fix is 045°T, 2.8 nm from Tern Island tower. You steer 145°T at 5.6 kn through the water. At 1445 a new fix puts you 058°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1445 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