Worksheet 81 · Skill 5

Set and drift

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1. At 1430 your fix is 032°T, 2.4 nm from Tern Island tower. You steer 125°T at 4.9 kn through the water. At 1515 a new fix puts you 045°T, 4.0 nm from Gannet Rock daybeacon.

   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  

2. At 1410 your fix is 041°T, 3.0 nm from Westfield church spire. You steer 129°T at 6.7 kn through the water. At 1505 a new fix puts you 223°T, 2.9 nm from Tern Island tower.

   Plot the 1505 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  

3. At 1535 your fix is 058°T, 3.3 nm from Westfield church spire. You steer 160°T at 6.7 kn through the water. At 1630 a new fix puts you 338°T, 1.8 nm from Mill stack.

   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  

4. At 1450 your fix is 165°T, 1.6 nm from Westfield church spire. You steer 074°T at 5.0 kn through the water. At 1540 a new fix puts you 074°T, 3.7 nm from Westfield church spire.

   Plot the 1540 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  

5. At 0820 your fix is 026°T, 2.3 nm from Tern Island tower. You steer 150°T at 9.0 kn through the water. At 0855 a new fix puts you 123°T, 1.0 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1430 your fix is 267°T, 2.1 nm from Gannet Rock daybeacon. You steer 298°T at 4.3 kn through the water. At 1600 a new fix puts you 017°T, 3.6 nm from Westfield church spire.

   Plot the 1600 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  

7. At 1040 your fix is 330°T, 1.7 nm from Heron Point Light. You steer 099°T at 7.3 kn through the water. At 1155 a new fix puts you 297°T, 1.9 nm from Kittle water tank.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1050 your fix is 029°T, 3.3 nm from Heron Point Light. You steer 126°T at 6.6 kn through the water. At 1140 a new fix puts you 218°T, 2.0 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn