Worksheet 734 · Skill 5

Set and drift

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1. At 1430 your fix is 035°T, 3.5 nm from Westfield church spire. You steer 098°T at 7.3 kn through the water. At 1500 a new fix puts you 313°T, 1.6 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1245 your fix is 265°T, 1.6 nm from Gannet Rock daybeacon. You steer 276°T at 8.9 kn through the water. At 1320 a new fix puts you 098°T, 1.9 nm from Westfield church spire.

   Plot the 1320 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 1510 your fix is 243°T, 1.3 nm from Gannet Rock daybeacon. You steer 290°T at 5.8 kn through the water. At 1630 a new fix puts you 006°T, 1.9 nm from Westfield church spire.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1455 your fix is 300°T, 4.0 nm from Tern Island tower. You steer 151°T at 5.3 kn through the water. At 1610 a new fix puts you 359°T, 2.7 nm from Mill stack.

   Plot the 1610 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  

5. At 1040 your fix is 273°T, 2.6 nm from Tern Island tower. You steer 227°T at 6.9 kn through the water. At 1115 a new fix puts you 094°T, 1.6 nm from Westfield church spire.

   Plot the 1115 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 1540 your fix is 234°T, 2.5 nm from Tern Island tower. You steer 213°T at 6.3 kn through the water. At 1610 a new fix puts you 083°T, 1.3 nm from Heron Point Light.

   Plot the 1610 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 1235 your fix is 223°T, 2.0 nm from Tern Island tower. You steer 302°T at 4.0 kn through the water. At 1330 a new fix puts you 283°T, 2.9 nm from Tern Island tower.

   Plot the 1330 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 1510 your fix is 073°T, 3.2 nm from Westfield church spire. You steer 269°T at 4.2 kn through the water. At 1540 a new fix puts you 012°T, 1.7 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn