Worksheet 263 · Skill 5

Set and drift

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1. At 0720 your fix is 281°T, 1.8 nm from Tern Island tower. You steer 230°T at 4.2 kn through the water. At 0800 a new fix puts you 032°T, 3.1 nm from Heron Point Light.

   Plot the 0800 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 1420 your fix is 341°T, 1.9 nm from Tern Island tower. You steer 093°T at 5.6 kn through the water. At 1500 a new fix puts you 075°T, 2.6 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1410 your fix is 199°T, 1.6 nm from Tern Island tower. You steer 168°T at 4.3 kn through the water. At 1450 a new fix puts you 243°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1450 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  

4. At 1350 your fix is 041°T, 2.0 nm from Heron Point Light. You steer 119°T at 5.9 kn through the water. At 1430 a new fix puts you 047°T, 1.3 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1135 your fix is 301°T, 3.9 nm from Tern Island tower. You steer 205°T at 4.5 kn through the water. At 1230 a new fix puts you 018°T, 2.7 nm from Heron Point Light.

   Plot the 1230 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 1025 your fix is 029°T, 3.6 nm from Westfield church spire. You steer 137°T at 8.2 kn through the water. At 1100 a new fix puts you 234°T, 3.1 nm from Tern Island tower.

   Plot the 1100 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  

7. At 1350 your fix is 031°T, 3.6 nm from Heron Point Light. You steer 327°T at 4.4 kn through the water. At 1440 a new fix puts you 021°T, 2.3 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0845 your fix is 015°T, 1.8 nm from Mill stack. You steer 335°T at 7.0 kn through the water. At 0920 a new fix puts you 251°T, 2.5 nm from Tern Island tower.

   Plot the 0920 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