Worksheet 914 · Skill 5

Set and drift

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1. At 1415 your fix is 298°T, 2.6 nm from Tern Island tower. You steer 080°T at 5.3 kn through the water. At 1510 a new fix puts you 073°T, 3.8 nm from Tern Island tower.

   Plot the 1510 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  

2. At 1135 your fix is 048°T, 2.5 nm from Gannet Rock daybeacon. You steer 251°T at 4.1 kn through the water. At 1305 a new fix puts you 350°T, 2.1 nm from Mill stack.

   Plot the 1305 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1225 your fix is 105°T, 2.5 nm from Westfield church spire. You steer 325°T at 4.1 kn through the water. At 1305 a new fix puts you 033°T, 1.3 nm from Westfield church spire.

   Plot the 1305 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 1600 your fix is 008°T, 2.5 nm from Mill stack. You steer 323°T at 4.2 kn through the water. At 1700 a new fix puts you 093°T, 3.2 nm from Westfield church spire.

   Plot the 1700 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  

5. At 1330 your fix is 253°T, 2.2 nm from Gannet Rock daybeacon. You steer 048°T at 5.4 kn through the water. At 1405 a new fix puts you 346°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1405 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  

6. At 1040 your fix is 021°T, 2.1 nm from Mill stack. You steer 325°T at 5.3 kn through the water. At 1140 a new fix puts you 304°T, 4.3 nm from Tern Island tower.

   Plot the 1140 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  

7. At 0905 your fix is 009°T, 2.7 nm from Mill stack. You steer 291°T at 5.8 kn through the water. At 0950 a new fix puts you 025°T, 3.1 nm from Heron Point Light.

   Plot the 0950 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  

8. At 0825 your fix is 336°T, 1.4 nm from Kittle water tank. You steer 302°T at 5.8 kn through the water. At 0920 a new fix puts you 243°T, 2.1 nm from Tern Island tower.

   Plot the 0920 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