Worksheet 661 · Skill 5

Set and drift

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1. At 1255 your fix is 033°T, 1.4 nm from Gannet Rock daybeacon. You steer 028°T at 4.9 kn through the water. At 1340 a new fix puts you 064°T, 4.3 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1335 your fix is 039°T, 3.7 nm from Westfield church spire. You steer 207°T at 4.5 kn through the water. At 1410 a new fix puts you 082°T, 2.5 nm from Westfield church spire.

   Plot the 1410 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  

3. At 1000 your fix is 076°T, 2.3 nm from Heron Point Light. You steer 289°T at 4.4 kn through the water. At 1035 a new fix puts you 016°T, 1.9 nm from Heron Point Light.

   Plot the 1035 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 1600 your fix is 201°T, 2.0 nm from Gannet Rock daybeacon. You steer 289°T at 5.6 kn through the water. At 1725 a new fix puts you 089°T, 3.2 nm from Westfield church spire.

   Plot the 1725 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  

5. At 0915 your fix is 037°T, 3.5 nm from Heron Point Light. You steer 093°T at 5.3 kn through the water. At 1035 a new fix puts you 072°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1035 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  

6. At 1445 your fix is 034°T, 2.9 nm from Westfield church spire. You steer 095°T at 5.4 kn through the water. At 1520 a new fix puts you 290°T, 3.8 nm from Tern Island tower.

   Plot the 1520 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 049°T, 3.6 nm from Gannet Rock daybeacon. You steer 178°T at 6.3 kn through the water. At 0750 a new fix puts you 071°T, 2.0 nm from Kittle water tank.

   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 0825 your fix is 003°T, 1.9 nm from Heron Point Light. You steer 031°T at 5.3 kn through the water. At 0855 a new fix puts you 272°T, 3.7 nm from Tern Island tower.

   Plot the 0855 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