Worksheet 130 · Skill 5

Set and drift

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1. At 0710 your fix is 010°T, 1.3 nm from Gannet Rock daybeacon. You steer 141°T at 4.9 kn through the water. At 0805 a new fix puts you 090°T, 2.5 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1250 your fix is 074°T, 3.2 nm from Tern Island tower. You steer 186°T at 4.1 kn through the water. At 1345 a new fix puts you 174°T, 1.8 nm from Gannet Rock daybeacon.

   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  

3. At 1150 your fix is 003°T, 1.9 nm from Heron Point Light. You steer 107°T at 4.5 kn through the water. At 1220 a new fix puts you 336°T, 2.1 nm from Mill stack.

   Plot the 1220 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  

4. At 0830 your fix is 331°T, 2.0 nm from Tern Island tower. You steer 240°T at 5.6 kn through the water. At 0920 a new fix puts you 062°T, 2.0 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1205 your fix is 272°T, 2.0 nm from Gannet Rock daybeacon. You steer 323°T at 4.3 kn through the water. At 1235 a new fix puts you 239°T, 2.7 nm from Tern Island tower.

   Plot the 1235 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 1325 your fix is 259°T, 3.6 nm from Tern Island tower. You steer 305°T at 5.7 kn through the water. At 1405 a new fix puts you 024°T, 2.6 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1455 your fix is 031°T, 3.6 nm from Gannet Rock daybeacon. You steer 240°T at 6.6 kn through the water. At 1535 a new fix puts you 298°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1535 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  

8. At 1320 your fix is 034°T, 3.6 nm from Heron Point Light. You steer 113°T at 5.3 kn through the water. At 1350 a new fix puts you 197°T, 2.3 nm from Tern Island tower.

   Plot the 1350 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