Worksheet 277 · Skill 5

Set and drift

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1. At 1400 your fix is 294°T, 3.7 nm from Tern Island tower. You steer 157°T at 7.8 kn through the water. At 1435 a new fix puts you 208°T, 1.9 nm from Tern Island tower.

   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  

2. At 1320 your fix is 214°T, 1.7 nm from Gannet Rock daybeacon. You steer 094°T at 4.2 kn through the water. At 1410 a new fix puts you 059°T, 2.0 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1030 your fix is 065°T, 2.4 nm from Gannet Rock daybeacon. You steer 167°T at 5.1 kn through the water. At 1100 a new fix puts you 030°T, 2.2 nm from Kittle water tank.

   Plot the 1100 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  

4. At 1115 your fix is 029°T, 1.9 nm from Tern Island tower. You steer 126°T at 4.8 kn through the water. At 1155 a new fix puts you 038°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1155 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  

5. At 1000 your fix is 045°T, 3.2 nm from Tern Island tower. You steer 250°T at 8.3 kn through the water. At 1040 a new fix puts you 272°T, 3.3 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1155 your fix is 022°T, 1.7 nm from Tern Island tower. You steer 140°T at 5.8 kn through the water. At 1250 a new fix puts you 100°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1250 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  

7. At 1040 your fix is 291°T, 3.0 nm from Tern Island tower. You steer 241°T at 4.3 kn through the water. At 1120 a new fix puts you 082°T, 2.9 nm from Westfield church spire.

   Plot the 1120 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  

8. At 1425 your fix is 256°T, 1.7 nm from Tern Island tower. You steer 294°T at 6.1 kn through the water. At 1515 a new fix puts you 010°T, 2.8 nm from Westfield church spire.

   Plot the 1515 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