Worksheet 478 · Skill 5

Set and drift

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1. At 1205 your fix is 043°T, 3.2 nm from Gannet Rock daybeacon. You steer 234°T at 6.3 kn through the water. At 1300 a new fix puts you 214°T, 1.9 nm from Tern Island tower.

   Plot the 1300 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  

2. At 1040 your fix is 256°T, 3.0 nm from Gannet Rock daybeacon. You steer 058°T at 7.2 kn through the water. At 1130 a new fix puts you 033°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1130 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  

3. At 0810 your fix is 041°T, 3.0 nm from Gannet Rock daybeacon. You steer 253°T at 4.3 kn through the water. At 0920 a new fix puts you 356°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 0920 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  

4. At 1230 your fix is 048°T, 4.1 nm from Westfield church spire. You steer 151°T at 6.3 kn through the water. At 1325 a new fix puts you 221°T, 1.5 nm from Tern Island tower.

   Plot the 1325 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  

5. At 0705 your fix is 343°T, 2.9 nm from Mill stack. You steer 021°T at 4.0 kn through the water. At 0745 a new fix puts you 227°T, 2.1 nm from Tern Island tower.

   Plot the 0745 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  

6. At 0915 your fix is 052°T, 3.8 nm from Gannet Rock daybeacon. You steer 247°T at 6.1 kn through the water. At 0955 a new fix puts you 136°T, 2.4 nm from Tern Island tower.

   Plot the 0955 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  

7. At 1550 your fix is 326°T, 1.8 nm from Tern Island tower. You steer 237°T at 5.9 kn through the water. At 1630 a new fix puts you 268°T, 2.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1145 your fix is 016°T, 1.4 nm from Kittle water tank. You steer 274°T at 6.1 kn through the water. At 1225 a new fix puts you 217°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1225 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