Worksheet 33 · Skill 5

Set and drift

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1. At 1420 your fix is 253°T, 2.8 nm from Tern Island tower. You steer 131°T at 5.7 kn through the water. At 1505 a new fix puts you 047°T, 2.4 nm from Mill stack.

   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  

2. At 1010 your fix is 212°T, 1.4 nm from Gannet Rock daybeacon. You steer 296°T at 4.5 kn through the water. At 1105 a new fix puts you 271°T, 2.4 nm from Tern Island tower.

   Plot the 1105 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  

3. At 1455 your fix is 023°T, 2.3 nm from Tern Island tower. You steer 237°T at 4.8 kn through the water. At 1530 a new fix puts you 282°T, 2.2 nm from Tern Island tower.

   Plot the 1530 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 1440 your fix is 133°T, 2.0 nm from Westfield church spire. You steer 092°T at 7.9 kn through the water. At 1535 a new fix puts you 307°T, 1.8 nm from Kittle water tank.

   Plot the 1535 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  

5. At 1155 your fix is 056°T, 1.8 nm from Gannet Rock daybeacon. You steer 276°T at 5.5 kn through the water. At 1315 a new fix puts you 046°T, 3.0 nm from Heron Point Light.

   Plot the 1315 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1110 your fix is 041°T, 2.5 nm from Heron Point Light. You steer 180°T at 4.6 kn through the water. At 1140 a new fix puts you 086°T, 1.1 nm from Heron Point Light.

   Plot the 1140 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  

7. At 0745 your fix is 220°T, 3.5 nm from Tern Island tower. You steer 333°T at 6.3 kn through the water. At 0825 a new fix puts you 030°T, 3.6 nm from Westfield church spire.

   Plot the 0825 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  

8. At 0745 your fix is 000°T, 2.5 nm from Mill stack. You steer 336°T at 8.9 kn through the water. At 0815 a new fix puts you 261°T, 2.8 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn