Worksheet 654 · Skill 5

Set and drift

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1. At 1220 your fix is 059°T, 1.5 nm from Heron Point Light. You steer 099°T at 8.1 kn through the water. At 1250 a new fix puts you 052°T, 2.5 nm from Mill stack.

   Plot the 1250 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  

2. At 1115 your fix is 354°T, 2.5 nm from Mill stack. You steer 312°T at 6.6 kn through the water. At 1210 a new fix puts you 007°T, 3.3 nm from Westfield church spire.

   Plot the 1210 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 0950 your fix is 005°T, 3.2 nm from Westfield church spire. You steer 125°T at 8.8 kn through the water. At 1030 a new fix puts you 252°T, 1.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1120 your fix is 095°T, 2.2 nm from Westfield church spire. You steer 028°T at 7.5 kn through the water. At 1155 a new fix puts you 304°T, 4.1 nm from Tern Island tower.

   Plot the 1155 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  

5. At 1425 your fix is 338°T, 2.3 nm from Mill stack. You steer 114°T at 4.5 kn through the water. At 1455 a new fix puts you 025°T, 1.2 nm from Mill stack.

   Plot the 1455 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  

6. At 1510 your fix is 015°T, 1.4 nm from Westfield church spire. You steer 142°T at 4.1 kn through the water. At 1620 a new fix puts you 036°T, 2.9 nm from Heron Point Light.

   Plot the 1620 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0735 your fix is 347°T, 2.3 nm from Tern Island tower. You steer 210°T at 6.2 kn through the water. At 0815 a new fix puts you 242°T, 3.4 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0820 your fix is 087°T, 3.0 nm from Westfield church spire. You steer 169°T at 8.5 kn through the water. At 0850 a new fix puts you 100°T, 1.7 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn