Worksheet 376 · Skill 5

Set and drift

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1. At 0835 your fix is 149°T, 1.6 nm from Westfield church spire. You steer 089°T at 8.8 kn through the water. At 0925 a new fix puts you 327°T, 3.1 nm from Kittle water tank.

   Plot the 0925 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  

2. At 0910 your fix is 347°T, 2.3 nm from Mill stack. You steer 262°T at 4.8 kn through the water. At 0940 a new fix puts you 103°T, 1.5 nm from Heron Point Light.

   Plot the 0940 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 1055 your fix is 202°T, 2.6 nm from Tern Island tower. You steer 310°T at 6.3 kn through the water. At 1205 a new fix puts you 038°T, 2.6 nm from Westfield church spire.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0900 your fix is 095°T, 1.2 nm from Heron Point Light. You steer 075°T at 8.4 kn through the water. At 1000 a new fix puts you 037°T, 1.3 nm from Kittle water tank.

   Plot the 1000 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  

5. At 1220 your fix is 055°T, 4.0 nm from Westfield church spire. You steer 193°T at 4.3 kn through the water. At 1250 a new fix puts you 080°T, 2.3 nm from Westfield church spire.

   Plot the 1250 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 1520 your fix is 078°T, 2.6 nm from Gannet Rock daybeacon. You steer 240°T at 6.8 kn through the water. At 1550 a new fix puts you 225°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1550 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  

7. At 1405 your fix is 296°T, 3.6 nm from Tern Island tower. You steer 164°T at 6.5 kn through the water. At 1440 a new fix puts you 245°T, 2.9 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0955 your fix is 029°T, 2.6 nm from Mill stack. You steer 284°T at 6.9 kn through the water. At 1040 a new fix puts you 119°T, 1.3 nm from Westfield church spire.

   Plot the 1040 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