Worksheet 427 · Skill 5

Set and drift

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1. At 1200 your fix is 019°T, 2.2 nm from Kittle water tank. You steer 272°T at 4.6 kn through the water. At 1320 a new fix puts you 336°T, 2.1 nm from Mill stack.

   Plot the 1320 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  

2. At 1035 your fix is 036°T, 1.2 nm from Westfield church spire. You steer 130°T at 5.8 kn through the water. At 1110 a new fix puts you 091°T, 2.5 nm from Westfield church spire.

   Plot the 1110 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 092°T, 3.6 nm from Westfield church spire. You steer 103°T at 5.4 kn through the water. At 1100 a new fix puts you 301°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1100 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  

4. At 1140 your fix is 310°T, 1.7 nm from Kittle water tank. You steer 316°T at 5.2 kn through the water. At 1215 a new fix puts you 256°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1215 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 0840 your fix is 327°T, 1.5 nm from Heron Point Light. You steer 104°T at 4.7 kn through the water. At 0940 a new fix puts you 008°T, 2.4 nm from Mill stack.

   Plot the 0940 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 1415 your fix is 066°T, 1.6 nm from Heron Point Light. You steer 320°T at 5.0 kn through the water. At 1500 a new fix puts you 095°T, 1.5 nm from Westfield church spire.

   Plot the 1500 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  

7. At 1410 your fix is 349°T, 3.0 nm from Mill stack. You steer 003°T at 7.6 kn through the water. At 1440 a new fix puts you 283°T, 2.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0725 your fix is 071°T, 1.2 nm from Westfield church spire. You steer 037°T at 6.4 kn through the water. At 0800 a new fix puts you 287°T, 3.9 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn