Worksheet 718 · Skill 5

Set and drift

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1. At 0920 your fix is 048°T, 1.9 nm from Westfield church spire. You steer 065°T at 4.3 kn through the water. At 1020 a new fix puts you 285°T, 1.7 nm from Tern Island tower.

   Plot the 1020 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  

2. At 1410 your fix is 238°T, 1.0 nm from Gannet Rock daybeacon. You steer 279°T at 6.9 kn through the water. At 1450 a new fix puts you 041°T, 2.0 nm from Heron Point Light.

   Plot the 1450 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  

3. At 0850 your fix is 046°T, 4.1 nm from Gannet Rock daybeacon. You steer 182°T at 8.2 kn through the water. At 0920 a new fix puts you 034°T, 2.9 nm from Kittle water tank.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1315 your fix is 005°T, 2.9 nm from Mill stack. You steer 275°T at 4.0 kn through the water. At 1415 a new fix puts you 120°T, 1.2 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1130 your fix is 228°T, 2.1 nm from Gannet Rock daybeacon. You steer 330°T at 5.1 kn through the water. At 1205 a new fix puts you 264°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1205 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  

6. At 1105 your fix is 301°T, 1.1 nm from Gannet Rock daybeacon. You steer 039°T at 4.5 kn through the water. At 1145 a new fix puts you 065°T, 4.1 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1400 your fix is 303°T, 3.9 nm from Tern Island tower. You steer 093°T at 6.1 kn through the water. At 1505 a new fix puts you 076°T, 3.1 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0745 your fix is 222°T, 2.4 nm from Gannet Rock daybeacon. You steer 096°T at 5.6 kn through the water. At 0820 a new fix puts you 017°T, 1.8 nm from Kittle water tank.

   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