Worksheet 40 · Skill 5

Set and drift

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1. At 0945 your fix is 241°T, 2.7 nm from Tern Island tower. You steer 128°T at 9.0 kn through the water. At 1015 a new fix puts you 280°T, 2.1 nm from Kittle water tank.

   Plot the 1015 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 051°T, 3.4 nm from Tern Island tower. You steer 165°T at 5.7 kn through the water. At 1405 a new fix puts you 029°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1405 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 1140 your fix is 308°T, 3.4 nm from Tern Island tower. You steer 106°T at 6.7 kn through the water. At 1240 a new fix puts you 056°T, 3.7 nm from Gannet Rock daybeacon.

   Plot the 1240 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 1500 your fix is 298°T, 3.8 nm from Tern Island tower. You steer 254°T at 4.4 kn through the water. At 1540 a new fix puts you 042°T, 3.2 nm from Westfield church spire.

   Plot the 1540 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 1130 your fix is 282°T, 3.1 nm from Tern Island tower. You steer 129°T at 8.4 kn through the water. At 1225 a new fix puts you 329°T, 1.3 nm from Kittle water tank.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1240 your fix is 312°T, 3.0 nm from Tern Island tower. You steer 246°T at 4.6 kn through the water. At 1315 a new fix puts you 039°T, 4.3 nm from Westfield church spire.

   Plot the 1315 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 0705 your fix is 035°T, 2.7 nm from Kittle water tank. You steer 275°T at 7.1 kn through the water. At 0750 a new fix puts you 249°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0750 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  

8. At 1520 your fix is 277°T, 3.0 nm from Tern Island tower. You steer 056°T at 4.0 kn through the water. At 1550 a new fix puts you 329°T, 2.1 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn