Worksheet 367 · Skill 5

Set and drift

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1. At 0830 your fix is 049°T, 3.0 nm from Tern Island tower. You steer 276°T at 5.2 kn through the water. At 0915 a new fix puts you 318°T, 1.6 nm from Tern Island tower.

   Plot the 0915 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 1255 your fix is 150°T, 2.4 nm from Tern Island tower. You steer 270°T at 8.0 kn through the water. At 1325 a new fix puts you 216°T, 3.4 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1515 your fix is 085°T, 2.1 nm from Heron Point Light. You steer 077°T at 4.4 kn through the water. At 1615 a new fix puts you 000°T, 1.0 nm from Kittle water tank.

   Plot the 1615 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 1400 your fix is 002°T, 3.5 nm from Westfield church spire. You steer 142°T at 6.7 kn through the water. At 1450 a new fix puts you 267°T, 3.2 nm from Tern Island tower.

   Plot the 1450 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  

5. At 1330 your fix is 196°T, 1.4 nm from Tern Island tower. You steer 298°T at 5.1 kn through the water. At 1420 a new fix puts you 087°T, 2.3 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0840 your fix is 095°T, 1.6 nm from Tern Island tower. You steer 214°T at 6.8 kn through the water. At 0915 a new fix puts you 239°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 0915 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  

7. At 1035 your fix is 272°T, 2.1 nm from Gannet Rock daybeacon. You steer 219°T at 4.7 kn through the water. At 1105 a new fix puts you 335°T, 1.8 nm from Mill stack.

   Plot the 1105 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 1500 your fix is 335°T, 2.4 nm from Mill stack. You steer 008°T at 5.5 kn through the water. At 1535 a new fix puts you 036°T, 3.6 nm from Heron Point Light.

   Plot the 1535 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