Worksheet 58 · Skill 5

Set and drift

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1. At 1355 your fix is 010°T, 3.0 nm from Mill stack. You steer 327°T at 5.5 kn through the water. At 1500 a new fix puts you 291°T, 4.2 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0825 your fix is 270°T, 2.6 nm from Tern Island tower. You steer 131°T at 5.2 kn through the water. At 0945 a new fix puts you 163°T, 1.4 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0825 your fix is 132°T, 1.2 nm from Westfield church spire. You steer 104°T at 7.6 kn through the water. At 0905 a new fix puts you 012°T, 2.5 nm from Mill stack.

   Plot the 0905 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 0945 your fix is 289°T, 1.3 nm from Gannet Rock daybeacon. You steer 074°T at 7.3 kn through the water. At 1020 a new fix puts you 064°T, 2.8 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1125 your fix is 001°T, 1.2 nm from Heron Point Light. You steer 000°T at 5.4 kn through the water. At 1205 a new fix puts you 025°T, 1.7 nm from Westfield church spire.

   Plot the 1205 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 1440 your fix is 013°T, 1.3 nm from Heron Point Light. You steer 096°T at 6.7 kn through the water. At 1555 a new fix puts you 050°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1555 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  

7. At 0815 your fix is 036°T, 2.7 nm from Tern Island tower. You steer 136°T at 4.1 kn through the water. At 0910 a new fix puts you 043°T, 2.7 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 0810 your fix is 049°T, 1.9 nm from Heron Point Light. You steer 006°T at 4.3 kn through the water. At 0855 a new fix puts you 028°T, 3.4 nm from Heron Point Light.

   Plot the 0855 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