Worksheet 322 · Skill 5

Set and drift

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1. At 1350 your fix is 050°T, 2.5 nm from Mill stack. You steer 010°T at 4.4 kn through the water. At 1420 a new fix puts you 223°T, 0.9 nm from Gannet Rock daybeacon.

   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  

2. At 1510 your fix is 031°T, 2.5 nm from Kittle water tank. You steer 267°T at 5.7 kn through the water. At 1540 a new fix puts you 343°T, 2.8 nm from Kittle water tank.

   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  

3. At 1040 your fix is 080°T, 2.7 nm from Tern Island tower. You steer 228°T at 4.2 kn through the water. At 1145 a new fix puts you 014°T, 2.5 nm from Mill stack.

   Plot the 1145 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  

4. At 0755 your fix is 044°T, 2.3 nm from Mill stack. You steer 294°T at 8.4 kn through the water. At 0845 a new fix puts you 117°T, 1.6 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1140 your fix is 063°T, 5.3 nm from Tern Island tower. You steer 266°T at 4.7 kn through the water. At 1220 a new fix puts you 070°T, 2.4 nm from Tern Island tower.

   Plot the 1220 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 1340 your fix is 242°T, 1.0 nm from Gannet Rock daybeacon. You steer 307°T at 6.6 kn through the water. At 1425 a new fix puts you 243°T, 2.1 nm from Tern Island tower.

   Plot the 1425 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  

7. At 1400 your fix is 086°T, 2.8 nm from Westfield church spire. You steer 059°T at 6.0 kn through the water. At 1445 a new fix puts you 306°T, 1.7 nm from Tern Island tower.

   Plot the 1445 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  

8. At 1520 your fix is 023°T, 2.9 nm from Westfield church spire. You steer 157°T at 5.1 kn through the water. At 1610 a new fix puts you 037°T, 2.0 nm from Heron Point Light.

   Plot the 1610 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