Worksheet 919 · Skill 5

Set and drift

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1. At 1035 your fix is 022°T, 2.4 nm from Heron Point Light. You steer 112°T at 7.0 kn through the water. At 1115 a new fix puts you 252°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1115 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 0905 your fix is 045°T, 2.7 nm from Westfield church spire. You steer 089°T at 6.4 kn through the water. At 0950 a new fix puts you 303°T, 2.7 nm from Tern Island tower.

   Plot the 0950 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  

3. At 1330 your fix is 044°T, 1.9 nm from Kittle water tank. You steer 324°T at 8.0 kn through the water. At 1405 a new fix puts you 115°T, 1.5 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1510 your fix is 081°T, 3.0 nm from Westfield church spire. You steer 311°T at 6.8 kn through the water. At 1540 a new fix puts you 024°T, 2.5 nm from Westfield church spire.

   Plot the 1540 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  

5. At 1405 your fix is 269°T, 2.8 nm from Tern Island tower. You steer 193°T at 5.6 kn through the water. At 1440 a new fix puts you 054°T, 2.8 nm from Heron Point Light.

   Plot the 1440 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 0735 your fix is 070°T, 2.7 nm from Westfield church spire. You steer 130°T at 4.3 kn through the water. At 0905 a new fix puts you 205°T, 0.8 nm from Gannet Rock daybeacon.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1040 your fix is 035°T, 3.0 nm from Westfield church spire. You steer 089°T at 4.0 kn through the water. At 1130 a new fix puts you 282°T, 3.9 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1445 your fix is 086°T, 2.1 nm from Heron Point Light. You steer 063°T at 8.3 kn through the water. At 1535 a new fix puts you 133°T, 1.0 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn