Worksheet 437 · Skill 5

Set and drift

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1. At 0950 your fix is 297°T, 2.4 nm from Tern Island tower. You steer 212°T at 4.6 kn through the water. At 1040 a new fix puts you 100°T, 2.8 nm from Westfield church spire.

   Plot the 1040 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  

2. At 1405 your fix is 026°T, 1.2 nm from Heron Point Light. You steer 339°T at 5.0 kn through the water. At 1520 a new fix puts you 026°T, 3.3 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1400 your fix is 074°T, 2.9 nm from Tern Island tower. You steer 160°T at 4.7 kn through the water. At 1435 a new fix puts you 045°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1435 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 0700 your fix is 219°T, 2.1 nm from Gannet Rock daybeacon. You steer 282°T at 5.2 kn through the water. At 0735 a new fix puts you 043°T, 2.8 nm from Heron Point Light.

   Plot the 0735 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 1335 your fix is 049°T, 1.7 nm from Westfield church spire. You steer 039°T at 4.9 kn through the water. At 1410 a new fix puts you 299°T, 4.4 nm from Tern Island tower.

   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  

6. At 1600 your fix is 029°T, 2.7 nm from Westfield church spire. You steer 071°T at 4.1 kn through the water. At 1630 a new fix puts you 043°T, 3.6 nm from Westfield church spire.

   Plot the 1630 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 1045 your fix is 097°T, 3.0 nm from Gannet Rock daybeacon. You steer 242°T at 6.1 kn through the water. At 1115 a new fix puts you 336°T, 1.4 nm from Kittle water tank.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1325 your fix is 052°T, 3.5 nm from Heron Point Light. You steer 304°T at 7.1 kn through the water. At 1400 a new fix puts you 063°T, 1.4 nm from Westfield church spire.

   Plot the 1400 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