Worksheet 703 · Skill 5

Set and drift

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1. At 0825 your fix is 054°T, 0.8 nm from Heron Point Light. You steer 354°T at 7.7 kn through the water. At 0905 a new fix puts you 054°T, 2.8 nm from Westfield church spire.

   Plot the 0905 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 1250 your fix is 052°T, 2.4 nm from Heron Point Light. You steer 349°T at 7.3 kn through the water. At 1330 a new fix puts you 031°T, 3.5 nm from Westfield church spire.

   Plot the 1330 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  

3. At 0945 your fix is 299°T, 4.3 nm from Tern Island tower. You steer 144°T at 5.6 kn through the water. At 1105 a new fix puts you 239°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1105 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  

4. At 1315 your fix is 349°T, 2.5 nm from Tern Island tower. You steer 251°T at 6.6 kn through the water. At 1350 a new fix puts you 041°T, 3.0 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1005 your fix is 004°T, 2.3 nm from Mill stack. You steer 047°T at 7.2 kn through the water. At 1050 a new fix puts you 042°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1050 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  

6. At 1300 your fix is 069°T, 2.4 nm from Tern Island tower. You steer 146°T at 8.3 kn through the water. At 1330 a new fix puts you 097°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1330 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 1440 your fix is 020°T, 1.7 nm from Westfield church spire. You steer 079°T at 7.5 kn through the water. At 1535 a new fix puts you 039°T, 2.1 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0955 your fix is 359°T, 2.4 nm from Tern Island tower. You steer 258°T at 5.8 kn through the water. At 1050 a new fix puts you 024°T, 3.2 nm from Westfield church spire.

   Plot the 1050 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