Worksheet 454 · Skill 5

Set and drift

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1. At 1215 your fix is 044°T, 3.4 nm from Westfield church spire. You steer 135°T at 6.4 kn through the water. At 1310 a new fix puts you 228°T, 1.7 nm from Tern Island tower.

   Plot the 1310 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  

2. At 1455 your fix is 280°T, 1.1 nm from Gannet Rock daybeacon. You steer 262°T at 5.6 kn through the water. At 1545 a new fix puts you 241°T, 3.1 nm from Tern Island tower.

   Plot the 1545 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 1350 your fix is 045°T, 3.3 nm from Tern Island tower. You steer 147°T at 5.1 kn through the water. At 1430 a new fix puts you 021°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1430 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  

4. At 0840 your fix is 299°T, 1.4 nm from Tern Island tower. You steer 230°T at 5.9 kn through the water. At 0915 a new fix puts you 102°T, 2.8 nm from Westfield church spire.

   Plot the 0915 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 1100 your fix is 125°T, 1.5 nm from Gannet Rock daybeacon. You steer 263°T at 4.3 kn through the water. At 1205 a new fix puts you 333°T, 1.4 nm from Mill stack.

   Plot the 1205 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  

6. At 1220 your fix is 076°T, 3.9 nm from Tern Island tower. You steer 219°T at 6.6 kn through the water. At 1255 a new fix puts you 321°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1255 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 0810 your fix is 072°T, 1.9 nm from Tern Island tower. You steer 145°T at 6.8 kn through the water. At 0845 a new fix puts you 017°T, 1.9 nm from Kittle water tank.

   Plot the 0845 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  

8. At 1420 your fix is 214°T, 1.7 nm from Gannet Rock daybeacon. You steer 090°T at 5.6 kn through the water. At 1450 a new fix puts you 039°T, 1.9 nm from Kittle water tank.

   Plot the 1450 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