Worksheet 820 · Skill 5

Set and drift

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1. At 0905 your fix is 030°T, 2.5 nm from Gannet Rock daybeacon. You steer 199°T at 4.4 kn through the water. At 0945 a new fix puts you 342°T, 2.9 nm from Kittle water tank.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1555 your fix is 053°T, 3.3 nm from Heron Point Light. You steer 191°T at 4.2 kn through the water. At 1625 a new fix puts you 075°T, 2.5 nm from Heron Point Light.

   Plot the 1625 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 1430 your fix is 330°T, 1.3 nm from Tern Island tower. You steer 233°T at 4.6 kn through the water. At 1550 a new fix puts you 054°T, 1.1 nm from Westfield church spire.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0705 your fix is 209°T, 1.8 nm from Tern Island tower. You steer 324°T at 7.3 kn through the water. At 0735 a new fix puts you 302°T, 3.7 nm from Tern Island tower.

   Plot the 0735 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 0700 your fix is 040°T, 1.0 nm from Westfield church spire. You steer 358°T at 4.9 kn through the water. At 0730 a new fix puts you 004°T, 3.1 nm from Westfield church spire.

   Plot the 0730 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 1345 your fix is 048°T, 3.3 nm from Heron Point Light. You steer 011°T at 5.6 kn through the water. At 1430 a new fix puts you 277°T, 2.3 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1115 your fix is 000°T, 1.4 nm from Heron Point Light. You steer 100°T at 4.4 kn through the water. At 1150 a new fix puts you 345°T, 2.8 nm from Mill stack.

   Plot the 1150 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 1415 your fix is 030°T, 1.7 nm from Westfield church spire. You steer 075°T at 5.5 kn through the water. At 1500 a new fix puts you 296°T, 4.3 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn