Worksheet 483 · Skill 5

Set and drift

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1. At 0715 your fix is 076°T, 2.4 nm from Westfield church spire. You steer 167°T at 5.7 kn through the water. At 0800 a new fix puts you 082°T, 1.6 nm from Heron Point Light.

   Plot the 0800 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 1255 your fix is 098°T, 1.4 nm from Gannet Rock daybeacon. You steer 359°T at 4.4 kn through the water. At 1400 a new fix puts you 051°T, 2.9 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1250 your fix is 298°T, 3.7 nm from Tern Island tower. You steer 100°T at 8.3 kn through the water. At 1340 a new fix puts you 062°T, 2.6 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1030 your fix is 017°T, 1.6 nm from Kittle water tank. You steer 004°T at 4.1 kn through the water. At 1130 a new fix puts you 061°T, 2.3 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1350 your fix is 281°T, 2.7 nm from Tern Island tower. You steer 178°T at 9.0 kn through the water. At 1420 a new fix puts you 070°T, 2.3 nm from Heron Point Light.

   Plot the 1420 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 0935 your fix is 038°T, 1.7 nm from Tern Island tower. You steer 145°T at 6.0 kn through the water. At 1025 a new fix puts you 087°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1025 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  

7. At 1330 your fix is 117°T, 2.1 nm from Gannet Rock daybeacon. You steer 345°T at 4.3 kn through the water. At 1400 a new fix puts you 061°T, 2.0 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1040 your fix is 029°T, 2.6 nm from Heron Point Light. You steer 035°T at 6.4 kn through the water. At 1125 a new fix puts you 313°T, 2.5 nm from Tern Island tower.

   Plot the 1125 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