Worksheet 831 · Skill 5

Set and drift

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1. At 1055 your fix is 216°T, 3.0 nm from Tern Island tower. You steer 333°T at 4.2 kn through the water. At 1145 a new fix puts you 254°T, 3.5 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0945 your fix is 117°T, 2.2 nm from Westfield church spire. You steer 065°T at 5.2 kn through the water. At 1030 a new fix puts you 279°T, 1.2 nm from Tern Island tower.

   Plot the 1030 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  

3. At 0730 your fix is 034°T, 1.4 nm from Kittle water tank. You steer 007°T at 4.3 kn through the water. At 0850 a new fix puts you 062°T, 4.4 nm from Tern Island tower.

   Plot the 0850 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  

4. At 1550 your fix is 270°T, 2.1 nm from Tern Island tower. You steer 055°T at 4.3 kn through the water. At 1635 a new fix puts you 346°T, 1.5 nm from Tern Island tower.

   Plot the 1635 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 0700 your fix is 041°T, 1.8 nm from Gannet Rock daybeacon. You steer 254°T at 5.5 kn through the water. At 0800 a new fix puts you 089°T, 3.2 nm from Westfield church spire.

   Plot the 0800 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  

6. At 0945 your fix is 121°T, 1.9 nm from Westfield church spire. You steer 105°T at 5.8 kn through the water. At 1045 a new fix puts you 273°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1045 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  

7. At 0755 your fix is 210°T, 1.9 nm from Gannet Rock daybeacon. You steer 015°T at 8.6 kn through the water. At 0825 a new fix puts you 083°T, 1.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1310 your fix is 294°T, 2.2 nm from Tern Island tower. You steer 181°T at 4.1 kn through the water. At 1340 a new fix puts you 237°T, 3.2 nm from Tern Island tower.

   Plot the 1340 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