Worksheet 112 · Skill 5

Set and drift

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1. At 0825 your fix is 295°T, 3.5 nm from Tern Island tower. You steer 139°T at 5.7 kn through the water. At 0945 a new fix puts you 190°T, 1.9 nm from Tern Island tower.

   Plot the 0945 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1510 your fix is 042°T, 2.5 nm from Tern Island tower. You steer 155°T at 7.7 kn through the water. At 1600 a new fix puts you 144°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1600 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 0845 your fix is 104°T, 2.1 nm from Gannet Rock daybeacon. You steer 345°T at 7.5 kn through the water. At 0920 a new fix puts you 056°T, 2.3 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1315 your fix is 303°T, 2.8 nm from Tern Island tower. You steer 173°T at 6.2 kn through the water. At 1355 a new fix puts you 226°T, 1.7 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1055 your fix is 301°T, 3.3 nm from Tern Island tower. You steer 233°T at 6.9 kn through the water. At 1125 a new fix puts you 098°T, 2.0 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1105 your fix is 259°T, 1.6 nm from Gannet Rock daybeacon. You steer 276°T at 6.6 kn through the water. At 1140 a new fix puts you 019°T, 2.7 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1055 your fix is 301°T, 1.2 nm from Tern Island tower. You steer 282°T at 5.1 kn through the water. At 1130 a new fix puts you 041°T, 3.9 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1310 your fix is 061°T, 2.7 nm from Tern Island tower. You steer 184°T at 4.3 kn through the water. At 1340 a new fix puts you 031°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1340 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