Worksheet 241 · Skill 5

Set and drift

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1. At 0750 your fix is 090°T, 1.7 nm from Heron Point Light. You steer 078°T at 4.9 kn through the water. At 0900 a new fix puts you 215°T, 2.1 nm from Gannet Rock daybeacon.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1055 your fix is 201°T, 2.2 nm from Tern Island tower. You steer 293°T at 8.4 kn through the water. At 1125 a new fix puts you 086°T, 1.6 nm from Westfield church spire.

   Plot the 1125 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  

3. At 1435 your fix is 087°T, 3.5 nm from Westfield church spire. You steer 177°T at 5.1 kn through the water. At 1505 a new fix puts you 061°T, 1.6 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1315 your fix is 034°T, 3.9 nm from Westfield church spire. You steer 178°T at 7.7 kn through the water. At 1355 a new fix puts you 306°T, 3.8 nm from Mill stack.

   Plot the 1355 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  

5. At 0755 your fix is 021°T, 3.4 nm from Westfield church spire. You steer 133°T at 6.9 kn through the water. At 0855 a new fix puts you 257°T, 2.8 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1205 your fix is 133°T, 1.0 nm from Gannet Rock daybeacon. You steer 236°T at 5.0 kn through the water. At 1235 a new fix puts you 205°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1235 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 0940 your fix is 238°T, 2.0 nm from Gannet Rock daybeacon. You steer 282°T at 8.9 kn through the water. At 1030 a new fix puts you 174°T, 1.3 nm from Westfield church spire.

   Plot the 1030 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  

8. At 0735 your fix is 236°T, 3.1 nm from Tern Island tower. You steer 342°T at 5.3 kn through the water. At 0805 a new fix puts you 067°T, 3.7 nm from Westfield church spire.

   Plot the 0805 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