Worksheet 291 · Skill 5

Set and drift

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1. At 1205 your fix is 231°T, 2.5 nm from Tern Island tower. You steer 312°T at 4.0 kn through the water. At 1310 a new fix puts you 011°T, 2.7 nm from Westfield church spire.

   Plot the 1310 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  

2. At 1305 your fix is 054°T, 4.0 nm from Tern Island tower. You steer 163°T at 5.2 kn through the water. At 1415 a new fix puts you 094°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1415 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  

3. At 0830 your fix is 060°T, 1.4 nm from Heron Point Light. You steer 076°T at 5.8 kn through the water. At 0900 a new fix puts you 012°T, 2.8 nm from Mill stack.

   Plot the 0900 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  

4. At 1125 your fix is 083°T, 3.5 nm from Westfield church spire. You steer 175°T at 4.6 kn through the water. At 1200 a new fix puts you 055°T, 1.7 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1030 your fix is 028°T, 2.0 nm from Westfield church spire. You steer 093°T at 4.0 kn through the water. At 1145 a new fix puts you 272°T, 3.6 nm from Tern Island tower.

   Plot the 1145 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  

6. At 0955 your fix is 054°T, 2.7 nm from Tern Island tower. You steer 144°T at 7.2 kn through the water. At 1025 a new fix puts you 039°T, 2.5 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0835 your fix is 127°T, 2.1 nm from Westfield church spire. You steer 070°T at 5.1 kn through the water. At 0925 a new fix puts you 253°T, 3.1 nm from Tern Island tower.

   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  

8. At 0810 your fix is 202°T, 2.3 nm from Gannet Rock daybeacon. You steer 306°T at 7.8 kn through the water. At 0920 a new fix puts you 101°T, 1.3 nm from Westfield church spire.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn