Worksheet 266 · Skill 5

Set and drift

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1. At 1325 your fix is 180°T, 1.7 nm from Gannet Rock daybeacon. You steer 274°T at 6.1 kn through the water. At 1400 a new fix puts you 035°T, 2.2 nm from Mill stack.

   Plot the 1400 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  

2. At 1350 your fix is 211°T, 1.5 nm from Tern Island tower. You steer 268°T at 4.2 kn through the water. At 1500 a new fix puts you 032°T, 1.8 nm from Westfield church spire.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1040 your fix is 288°T, 3.4 nm from Tern Island tower. You steer 171°T at 5.1 kn through the water. At 1140 a new fix puts you 325°T, 1.9 nm from Mill stack.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1230 your fix is 324°T, 2.0 nm from Tern Island tower. You steer 220°T at 7.9 kn through the water. At 1310 a new fix puts you 108°T, 2.3 nm from Westfield church spire.

   Plot the 1310 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 1510 your fix is 258°T, 2.7 nm from Tern Island tower. You steer 271°T at 4.7 kn through the water. At 1550 a new fix puts you 119°T, 1.5 nm from Westfield church spire.

   Plot the 1550 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 0845 your fix is 095°T, 2.8 nm from Westfield church spire. You steer 105°T at 7.5 kn through the water. At 0950 a new fix puts you 323°T, 2.8 nm from Kittle water tank.

   Plot the 0950 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0730 your fix is 068°T, 3.3 nm from Westfield church spire. You steer 153°T at 7.9 kn through the water. At 0805 a new fix puts you 213°T, 3.1 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1250 your fix is 337°T, 1.9 nm from Mill stack. You steer 312°T at 5.8 kn through the water. At 1345 a new fix puts you 107°T, 1.2 nm from Westfield church spire.

   Plot the 1345 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