Worksheet 849 · Skill 5

Set and drift

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1. At 0830 your fix is 092°T, 2.1 nm from Tern Island tower. You steer 223°T at 8.1 kn through the water. At 0910 a new fix puts you 020°T, 2.7 nm from Mill stack.

   Plot the 0910 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  

2. At 1400 your fix is 265°T, 2.5 nm from Tern Island tower. You steer 165°T at 5.6 kn through the water. At 1445 a new fix puts you 255°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1445 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 1550 your fix is 056°T, 2.3 nm from Westfield church spire. You steer 073°T at 4.9 kn through the water. At 1705 a new fix puts you 333°T, 1.1 nm from Tern Island tower.

   Plot the 1705 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 1245 your fix is 193°T, 2.1 nm from Gannet Rock daybeacon. You steer 328°T at 5.4 kn through the water. At 1345 a new fix puts you 235°T, 3.5 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1555 your fix is 356°T, 1.6 nm from Gannet Rock daybeacon. You steer 264°T at 8.0 kn through the water. At 1650 a new fix puts you 123°T, 1.0 nm from Westfield church spire.

   Plot the 1650 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  

6. At 1210 your fix is 058°T, 3.4 nm from Tern Island tower. You steer 153°T at 4.5 kn through the water. At 1305 a new fix puts you 032°T, 3.0 nm from Kittle water tank.

   Plot the 1305 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  

7. At 1000 your fix is 345°T, 2.1 nm from Mill stack. You steer 081°T at 8.7 kn through the water. At 1030 a new fix puts you 144°T, 1.3 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1350 your fix is 347°T, 3.1 nm from Mill stack. You steer 094°T at 7.2 kn through the water. At 1440 a new fix puts you 072°T, 1.7 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn