Worksheet 122 · Skill 5

Set and drift

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1. At 0710 your fix is 007°T, 1.2 nm from Heron Point Light. You steer 059°T at 4.3 kn through the water. At 0810 a new fix puts you 058°T, 2.8 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1100 your fix is 254°T, 2.5 nm from Gannet Rock daybeacon. You steer 037°T at 4.7 kn through the water. At 1135 a new fix puts you 279°T, 1.3 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1550 your fix is 087°T, 2.4 nm from Westfield church spire. You steer 050°T at 6.7 kn through the water. At 1630 a new fix puts you 318°T, 2.9 nm from Tern Island tower.

   Plot the 1630 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 0915 your fix is 071°T, 2.7 nm from Tern Island tower. You steer 202°T at 5.7 kn through the water. At 1015 a new fix puts you 359°T, 1.3 nm from Mill stack.

   Plot the 1015 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 1325 your fix is 135°T, 1.4 nm from Westfield church spire. You steer 085°T at 4.7 kn through the water. At 1405 a new fix puts you 221°T, 2.9 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0700 your fix is 108°T, 2.7 nm from Westfield church spire. You steer 068°T at 6.0 kn through the water. At 0730 a new fix puts you 253°T, 1.4 nm from Tern Island tower.

   Plot the 0730 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  

7. At 0815 your fix is 032°T, 2.0 nm from Kittle water tank. You steer 005°T at 6.6 kn through the water. At 0910 a new fix puts you 033°T, 3.3 nm from Gannet Rock daybeacon.

   Plot the 0910 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  

8. At 1440 your fix is 029°T, 3.2 nm from Heron Point Light. You steer 086°T at 7.1 kn through the water. At 1535 a new fix puts you 152°T, 2.5 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn