Worksheet 132 · Skill 5

Set and drift

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1. At 1335 your fix is 098°T, 1.0 nm from Westfield church spire. You steer 091°T at 8.5 kn through the water. At 1420 a new fix puts you 252°T, 1.6 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0850 your fix is 050°T, 3.6 nm from Westfield church spire. You steer 131°T at 7.6 kn through the water. At 0945 a new fix puts you 256°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0945 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 1105 your fix is 114°T, 1.5 nm from Westfield church spire. You steer 109°T at 8.8 kn through the water. At 1135 a new fix puts you 220°T, 3.3 nm from Tern Island tower.

   Plot the 1135 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  

4. At 1055 your fix is 026°T, 3.2 nm from Westfield church spire. You steer 140°T at 7.2 kn through the water. At 1210 a new fix puts you 005°T, 2.8 nm from Mill stack.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1315 your fix is 070°T, 2.3 nm from Tern Island tower. You steer 170°T at 5.2 kn through the water. At 1415 a new fix puts you 145°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1415 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 0930 your fix is 094°T, 1.8 nm from Tern Island tower. You steer 158°T at 4.9 kn through the water. At 1020 a new fix puts you 332°T, 1.0 nm from Kittle water tank.

   Plot the 1020 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 0805 your fix is 349°T, 2.4 nm from Mill stack. You steer 050°T at 6.1 kn through the water. At 0845 a new fix puts you 001°T, 1.7 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0730 your fix is 019°T, 2.2 nm from Mill stack. You steer 334°T at 4.3 kn through the water. At 0810 a new fix puts you 202°T, 2.4 nm from Tern Island tower.

   Plot the 0810 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