Worksheet 816 · Skill 5

Set and drift

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1. At 1105 your fix is 306°T, 1.6 nm from Kittle water tank. You steer 312°T at 4.0 kn through the water. At 1135 a new fix puts you 033°T, 2.6 nm from Mill stack.

   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  

2. At 1055 your fix is 249°T, 1.7 nm from Gannet Rock daybeacon. You steer 243°T at 6.7 kn through the water. At 1125 a new fix puts you 323°T, 1.5 nm from Mill stack.

   Plot the 1125 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 1145 your fix is 007°T, 1.7 nm from Mill stack. You steer 054°T at 4.3 kn through the water. At 1235 a new fix puts you 128°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1235 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  

4. At 0805 your fix is 067°T, 2.6 nm from Tern Island tower. You steer 188°T at 4.1 kn through the water. At 0840 a new fix puts you 355°T, 1.8 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1300 your fix is 347°T, 2.9 nm from Kittle water tank. You steer 349°T at 6.3 kn through the water. At 1350 a new fix puts you 047°T, 1.7 nm from Tern Island tower.

   Plot the 1350 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 1405 your fix is 314°T, 2.9 nm from Tern Island tower. You steer 177°T at 6.8 kn through the water. At 1500 a new fix puts you 342°T, 2.8 nm from Mill stack.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1145 your fix is 236°T, 2.1 nm from Gannet Rock daybeacon. You steer 303°T at 6.4 kn through the water. At 1245 a new fix puts you 026°T, 3.3 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1240 your fix is 041°T, 4.0 nm from Westfield church spire. You steer 126°T at 6.9 kn through the water. At 1320 a new fix puts you 261°T, 1.8 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn