Worksheet 858 · Skill 5

Set and drift

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1. At 1325 your fix is 083°T, 1.0 nm from Gannet Rock daybeacon. You steer 339°T at 5.7 kn through the water. At 1405 a new fix puts you 044°T, 2.2 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1005 your fix is 095°T, 1.2 nm from Gannet Rock daybeacon. You steer 355°T at 4.8 kn through the water. At 1040 a new fix puts you 090°T, 1.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1015 your fix is 340°T, 2.6 nm from Tern Island tower. You steer 254°T at 4.0 kn through the water. At 1055 a new fix puts you 054°T, 4.0 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1240 your fix is 222°T, 2.0 nm from Gannet Rock daybeacon. You steer 286°T at 4.5 kn through the water. At 1410 a new fix puts you 176°T, 1.2 nm from Westfield church spire.

   Plot the 1410 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  

5. At 1040 your fix is 269°T, 2.4 nm from Gannet Rock daybeacon. You steer 287°T at 6.2 kn through the water. At 1125 a new fix puts you 084°T, 2.4 nm from Westfield church spire.

   Plot the 1125 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 1525 your fix is 008°T, 1.8 nm from Tern Island tower. You steer 231°T at 4.2 kn through the water. At 1640 a new fix puts you 254°T, 2.3 nm from Tern Island tower.

   Plot the 1640 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  

7. At 1045 your fix is 048°T, 2.1 nm from Tern Island tower. You steer 268°T at 7.2 kn through the water. At 1200 a new fix puts you 055°T, 3.0 nm from Westfield church spire.

   Plot the 1200 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  

8. At 0835 your fix is 227°T, 1.8 nm from Gannet Rock daybeacon. You steer 320°T at 7.6 kn through the water. At 0910 a new fix puts you 237°T, 2.5 nm from Tern Island tower.

   Plot the 0910 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