Worksheet 96 · Skill 5

Set and drift

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1. At 1350 your fix is 288°T, 1.6 nm from Gannet Rock daybeacon. You steer 300°T at 4.8 kn through the water. At 1420 a new fix puts you 237°T, 1.9 nm from Tern Island tower.

   Plot the 1420 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 1335 your fix is 059°T, 4.2 nm from Tern Island tower. You steer 268°T at 8.1 kn through the water. At 1420 a new fix puts you 312°T, 1.4 nm from Tern Island tower.

   Plot the 1420 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  

3. At 1040 your fix is 049°T, 3.1 nm from Westfield church spire. You steer 087°T at 5.0 kn through the water. At 1155 a new fix puts you 021°T, 2.1 nm from Tern Island tower.

   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  

4. At 1400 your fix is 075°T, 2.3 nm from Westfield church spire. You steer 121°T at 7.2 kn through the water. At 1440 a new fix puts you 006°T, 3.0 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1025 your fix is 324°T, 2.3 nm from Tern Island tower. You steer 088°T at 5.0 kn through the water. At 1125 a new fix puts you 065°T, 5.1 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1405 your fix is 050°T, 3.2 nm from Gannet Rock daybeacon. You steer 291°T at 8.3 kn through the water. At 1440 a new fix puts you 329°T, 2.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1335 your fix is 255°T, 2.2 nm from Tern Island tower. You steer 289°T at 4.0 kn through the water. At 1430 a new fix puts you 035°T, 2.8 nm from Westfield church spire.

   Plot the 1430 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 1320 your fix is 038°T, 3.4 nm from Gannet Rock daybeacon. You steer 341°T at 4.1 kn through the water. At 1355 a new fix puts you 069°T, 2.9 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn