Worksheet 686 · Skill 5

Set and drift

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1. At 1305 your fix is 052°T, 3.1 nm from Heron Point Light. You steer 029°T at 5.3 kn through the water. At 1400 a new fix puts you 298°T, 2.6 nm from Tern Island tower.

   Plot the 1400 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 1535 your fix is 246°T, 1.3 nm from Gannet Rock daybeacon. You steer 256°T at 6.4 kn through the water. At 1610 a new fix puts you 334°T, 1.6 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0820 your fix is 062°T, 2.2 nm from Heron Point Light. You steer 036°T at 4.5 kn through the water. At 0910 a new fix puts you 277°T, 1.3 nm from Tern Island tower.

   Plot the 0910 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  

4. At 1125 your fix is 336°T, 2.4 nm from Tern Island tower. You steer 211°T at 5.0 kn through the water. At 1220 a new fix puts you 248°T, 2.8 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1210 your fix is 027°T, 2.6 nm from Westfield church spire. You steer 148°T at 8.9 kn through the water. At 1250 a new fix puts you 067°T, 2.5 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1445 your fix is 304°T, 3.5 nm from Mill stack. You steer 068°T at 6.0 kn through the water. At 1600 a new fix puts you 036°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1600 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  

7. At 1130 your fix is 267°T, 3.4 nm from Tern Island tower. You steer 186°T at 7.4 kn through the water. At 1200 a new fix puts you 039°T, 1.6 nm from Heron Point Light.

   Plot the 1200 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 1555 your fix is 103°T, 1.9 nm from Westfield church spire. You steer 098°T at 7.5 kn through the water. At 1645 a new fix puts you 177°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1645 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