Worksheet 30 · Skill 5

Set and drift

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1. At 1205 your fix is 102°T, 2.7 nm from Westfield church spire. You steer 139°T at 4.8 kn through the water. At 1240 a new fix puts you 059°T, 1.7 nm from Heron Point Light.

   Plot the 1240 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  

2. At 0930 your fix is 351°T, 0.8 nm from Kittle water tank. You steer 301°T at 4.2 kn through the water. At 1015 a new fix puts you 268°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1015 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 1205 your fix is 125°T, 1.6 nm from Tern Island tower. You steer 239°T at 8.0 kn through the water. At 1245 a new fix puts you 065°T, 2.9 nm from Heron Point Light.

   Plot the 1245 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 0800 your fix is 070°T, 2.4 nm from Westfield church spire. You steer 082°T at 6.9 kn through the water. At 0830 a new fix puts you 296°T, 2.3 nm from Tern Island tower.

   Plot the 0830 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  

5. At 1455 your fix is 006°T, 1.5 nm from Mill stack. You steer 047°T at 6.1 kn through the water. At 1555 a new fix puts you 348°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1555 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 0755 your fix is 029°T, 3.0 nm from Gannet Rock daybeacon. You steer 239°T at 6.7 kn through the water. At 0845 a new fix puts you 354°T, 2.1 nm from Mill stack.

   Plot the 0845 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  

7. At 1350 your fix is 214°T, 1.4 nm from Tern Island tower. You steer 221°T at 7.3 kn through the water. At 1420 a new fix puts you 348°T, 2.3 nm from Mill stack.

   Plot the 1420 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 0800 your fix is 196°T, 2.5 nm from Tern Island tower. You steer 343°T at 6.7 kn through the water. At 0840 a new fix puts you 284°T, 3.3 nm from Tern Island tower.

   Plot the 0840 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