Worksheet 879 · Skill 5

Set and drift

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1. At 1355 your fix is 357°T, 2.5 nm from Mill stack. You steer 051°T at 4.1 kn through the water. At 1430 a new fix puts you 273°T, 1.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0940 your fix is 080°T, 3.1 nm from Westfield church spire. You steer 129°T at 4.1 kn through the water. At 1035 a new fix puts you 042°T, 2.9 nm from Heron Point Light.

   Plot the 1035 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  

3. At 1235 your fix is 314°T, 1.8 nm from Tern Island tower. You steer 182°T at 8.0 kn through the water. At 1315 a new fix puts you 352°T, 2.3 nm from Mill stack.

   Plot the 1315 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 1550 your fix is 263°T, 2.7 nm from Gannet Rock daybeacon. You steer 064°T at 6.1 kn through the water. At 1620 a new fix puts you 137°T, 2.5 nm from Tern Island tower.

   Plot the 1620 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  

5. At 0710 your fix is 323°T, 2.3 nm from Tern Island tower. You steer 223°T at 8.2 kn through the water. At 0745 a new fix puts you 095°T, 2.6 nm from Westfield church spire.

   Plot the 0745 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 1100 your fix is 058°T, 3.0 nm from Gannet Rock daybeacon. You steer 256°T at 8.4 kn through the water. At 1145 a new fix puts you 207°T, 3.0 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0900 your fix is 296°T, 1.9 nm from Kittle water tank. You steer 320°T at 7.5 kn through the water. At 1010 a new fix puts you 047°T, 1.8 nm from Westfield church spire.

   Plot the 1010 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0925 your fix is 221°T, 1.5 nm from Gannet Rock daybeacon. You steer 070°T at 4.3 kn through the water. At 1025 a new fix puts you 012°T, 1.8 nm from Kittle water tank.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn