Worksheet 556 · Skill 5

Set and drift

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1. At 0910 your fix is 216°T, 3.0 nm from Tern Island tower. You steer 305°T at 7.3 kn through the water. At 0945 a new fix puts you 052°T, 3.1 nm from Westfield church spire.

   Plot the 0945 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 1230 your fix is 009°T, 3.4 nm from Westfield church spire. You steer 092°T at 4.4 kn through the water. At 1335 a new fix puts you 016°T, 1.4 nm from Tern Island tower.

   Plot the 1335 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  

3. At 1340 your fix is 057°T, 3.7 nm from Westfield church spire. You steer 132°T at 7.7 kn through the water. At 1440 a new fix puts you 325°T, 2.7 nm from Kittle water tank.

   Plot the 1440 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  

4. At 0855 your fix is 009°T, 2.1 nm from Gannet Rock daybeacon. You steer 175°T at 4.0 kn through the water. At 0930 a new fix puts you 140°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 0930 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 1535 your fix is 020°T, 2.9 nm from Westfield church spire. You steer 151°T at 6.5 kn through the water. At 1630 a new fix puts you 346°T, 2.5 nm from Mill stack.

   Plot the 1630 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  

6. At 1350 your fix is 118°T, 1.6 nm from Gannet Rock daybeacon. You steer 269°T at 6.5 kn through the water. At 1500 a new fix puts you 073°T, 2.6 nm from Heron Point Light.

   Plot the 1500 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  

7. At 0910 your fix is 067°T, 0.8 nm from Heron Point Light. You steer 080°T at 5.4 kn through the water. At 1025 a new fix puts you 203°T, 1.9 nm from Gannet Rock daybeacon.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1315 your fix is 348°T, 1.8 nm from Mill stack. You steer 327°T at 5.9 kn through the water. At 1350 a new fix puts you 114°T, 2.2 nm from Westfield church spire.

   Plot the 1350 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