Worksheet 797 · Skill 5

Set and drift

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1. At 1355 your fix is 032°T, 2.7 nm from Gannet Rock daybeacon. You steer 248°T at 8.3 kn through the water. At 1440 a new fix puts you 232°T, 3.5 nm from Tern Island tower.

   Plot the 1440 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 1300 your fix is 007°T, 2.1 nm from Mill stack. You steer 088°T at 4.1 kn through the water. At 1425 a new fix puts you 094°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1425 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0755 your fix is 006°T, 2.5 nm from Mill stack. You steer 287°T at 4.8 kn through the water. At 0900 a new fix puts you 167°T, 1.1 nm from Westfield church spire.

   Plot the 0900 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  

4. At 1430 your fix is 081°T, 1.4 nm from Westfield church spire. You steer 106°T at 7.5 kn through the water. At 1515 a new fix puts you 200°T, 2.6 nm from Tern Island tower.

   Plot the 1515 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  

5. At 0815 your fix is 110°T, 1.6 nm from Tern Island tower. You steer 238°T at 4.3 kn through the water. At 0905 a new fix puts you 251°T, 2.4 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1230 your fix is 064°T, 3.4 nm from Westfield church spire. You steer 146°T at 5.1 kn through the water. At 1340 a new fix puts you 202°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1340 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1125 your fix is 066°T, 2.7 nm from Heron Point Light. You steer 082°T at 4.2 kn through the water. At 1155 a new fix puts you 263°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1155 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  

8. At 1535 your fix is 286°T, 3.4 nm from Tern Island tower. You steer 160°T at 4.0 kn through the water. At 1630 a new fix puts you 222°T, 2.1 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn