Worksheet 653 · Skill 5

Set and drift

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1. At 0925 your fix is 300°T, 1.9 nm from Kittle water tank. You steer 302°T at 4.8 kn through the water. At 1040 a new fix puts you 211°T, 2.6 nm from Tern Island tower.

   Plot the 1040 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  

2. At 1515 your fix is 179°T, 1.5 nm from Tern Island tower. You steer 196°T at 4.0 kn through the water. At 1555 a new fix puts you 030°T, 1.8 nm from Mill stack.

   Plot the 1555 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 0810 your fix is 041°T, 2.4 nm from Tern Island tower. You steer 146°T at 5.9 kn through the water. At 0840 a new fix puts you 029°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 0840 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 1330 your fix is 058°T, 4.1 nm from Tern Island tower. You steer 191°T at 8.9 kn through the water. At 1415 a new fix puts you 320°T, 1.0 nm from Kittle water tank.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0720 your fix is 297°T, 3.5 nm from Tern Island tower. You steer 240°T at 4.3 kn through the water. At 0815 a new fix puts you 069°T, 1.4 nm from Westfield church spire.

   Plot the 0815 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  

6. At 0845 your fix is 312°T, 3.1 nm from Tern Island tower. You steer 223°T at 4.4 kn through the water. At 1015 a new fix puts you 139°T, 1.8 nm from Westfield church spire.

   Plot the 1015 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  

7. At 0850 your fix is 327°T, 1.8 nm from Mill stack. You steer 346°T at 6.6 kn through the water. At 0920 a new fix puts you 082°T, 2.8 nm from Westfield church spire.

   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  

8. At 1005 your fix is 212°T, 2.0 nm from Tern Island tower. You steer 136°T at 4.4 kn through the water. At 1040 a new fix puts you 239°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1040 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