Worksheet 364 · Skill 5

Set and drift

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1. At 1220 your fix is 132°T, 1.7 nm from Gannet Rock daybeacon. You steer 278°T at 5.6 kn through the water. At 1315 a new fix puts you 352°T, 2.6 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0800 your fix is 113°T, 1.3 nm from Gannet Rock daybeacon. You steer 007°T at 5.2 kn through the water. At 0840 a new fix puts you 083°T, 2.4 nm from Tern Island tower.

   Plot the 0840 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  

3. At 1110 your fix is 095°T, 2.5 nm from Gannet Rock daybeacon. You steer 329°T at 6.6 kn through the water. At 1140 a new fix puts you 080°T, 2.4 nm from Tern Island tower.

   Plot the 1140 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 1225 your fix is 051°T, 1.6 nm from Heron Point Light. You steer 025°T at 8.2 kn through the water. At 1305 a new fix puts you 303°T, 3.7 nm from Tern Island tower.

   Plot the 1305 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 1020 your fix is 041°T, 2.6 nm from Heron Point Light. You steer 076°T at 4.9 kn through the water. At 1050 a new fix puts you 242°T, 2.4 nm from Tern Island tower.

   Plot the 1050 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 1510 your fix is 133°T, 2.7 nm from Tern Island tower. You steer 282°T at 8.5 kn through the water. At 1610 a new fix puts you 071°T, 2.0 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1135 your fix is 331°T, 1.8 nm from Tern Island tower. You steer 097°T at 5.4 kn through the water. At 1205 a new fix puts you 057°T, 2.9 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0920 your fix is 348°T, 3.1 nm from Mill stack. You steer 275°T at 4.0 kn through the water. At 1005 a new fix puts you 107°T, 2.5 nm from Westfield church spire.

   Plot the 1005 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