Worksheet 926 · Skill 5

Set and drift

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1. At 0700 your fix is 062°T, 3.9 nm from Tern Island tower. You steer 183°T at 5.0 kn through the water. At 0745 a new fix puts you 145°T, 2.6 nm from Tern Island tower.

   Plot the 0745 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 1245 your fix is 247°T, 2.0 nm from Tern Island tower. You steer 137°T at 5.7 kn through the water. At 1325 a new fix puts you 275°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1325 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 1330 your fix is 358°T, 1.8 nm from Mill stack. You steer 331°T at 6.1 kn through the water. At 1430 a new fix puts you 026°T, 1.8 nm from Westfield church spire.

   Plot the 1430 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  

4. At 1525 your fix is 345°T, 1.9 nm from Tern Island tower. You steer 212°T at 4.5 kn through the water. At 1605 a new fix puts you 238°T, 3.5 nm from Tern Island tower.

   Plot the 1605 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  

5. At 1320 your fix is 018°T, 1.8 nm from Tern Island tower. You steer 242°T at 4.4 kn through the water. At 1440 a new fix puts you 103°T, 2.5 nm from Westfield church spire.

   Plot the 1440 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 1020 your fix is 056°T, 1.8 nm from Heron Point Light. You steer 004°T at 7.5 kn through the water. At 1050 a new fix puts you 080°T, 3.1 nm from Westfield church spire.

   Plot the 1050 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 1130 your fix is 359°T, 3.1 nm from Mill stack. You steer 288°T at 7.1 kn through the water. At 1200 a new fix puts you 088°T, 1.5 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0705 your fix is 064°T, 1.4 nm from Westfield church spire. You steer 115°T at 4.8 kn through the water. At 0755 a new fix puts you 358°T, 2.8 nm from Mill stack.

   Plot the 0755 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