Worksheet 346 · Skill 5

Set and drift

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1. At 1350 your fix is 246°T, 3.3 nm from Tern Island tower. You steer 197°T at 4.5 kn through the water. At 1430 a new fix puts you 061°T, 2.0 nm from Heron Point Light.

   Plot the 1430 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 0845 your fix is 265°T, 1.9 nm from Tern Island tower. You steer 219°T at 5.1 kn through the water. At 0935 a new fix puts you 119°T, 1.8 nm from Westfield church spire.

   Plot the 0935 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 0950 your fix is 035°T, 2.9 nm from Westfield church spire. You steer 182°T at 4.6 kn through the water. At 1030 a new fix puts you 093°T, 1.6 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1025 your fix is 324°T, 1.4 nm from Tern Island tower. You steer 265°T at 5.8 kn through the water. At 1100 a new fix puts you 295°T, 3.2 nm from Tern Island tower.

   Plot the 1100 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  

5. At 1235 your fix is 298°T, 2.4 nm from Tern Island tower. You steer 254°T at 8.5 kn through the water. At 1310 a new fix puts you 033°T, 2.2 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0720 your fix is 082°T, 2.2 nm from Westfield church spire. You steer 073°T at 4.1 kn through the water. At 0750 a new fix puts you 247°T, 3.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0735 your fix is 357°T, 1.0 nm from Gannet Rock daybeacon. You steer 243°T at 5.8 kn through the water. At 0805 a new fix puts you 264°T, 2.0 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1155 your fix is 035°T, 1.4 nm from Westfield church spire. You steer 116°T at 5.4 kn through the water. At 1320 a new fix puts you 266°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1320 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn