Worksheet 456 · Skill 5

Set and drift

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1. At 0715 your fix is 175°T, 0.9 nm from Gannet Rock daybeacon. You steer 297°T at 8.3 kn through the water. At 0800 a new fix puts you 252°T, 3.1 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1110 your fix is 041°T, 3.6 nm from Gannet Rock daybeacon. You steer 251°T at 4.6 kn through the water. At 1225 a new fix puts you 167°T, 1.4 nm from Tern Island tower.

   Plot the 1225 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  

3. At 0735 your fix is 047°T, 2.3 nm from Westfield church spire. You steer 119°T at 6.2 kn through the water. At 0850 a new fix puts you 018°T, 1.3 nm from Kittle water tank.

   Plot the 0850 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  

4. At 1020 your fix is 004°T, 3.2 nm from Mill stack. You steer 003°T at 6.8 kn through the water. At 1050 a new fix puts you 293°T, 2.2 nm from Tern Island tower.

   Plot the 1050 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 0935 your fix is 344°T, 1.9 nm from Heron Point Light. You steer 040°T at 4.4 kn through the water. At 1045 a new fix puts you 298°T, 4.3 nm from Tern Island tower.

   Plot the 1045 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  

6. At 1050 your fix is 217°T, 1.0 nm from Gannet Rock daybeacon. You steer 324°T at 4.8 kn through the water. At 1120 a new fix puts you 199°T, 1.7 nm from Tern Island tower.

   Plot the 1120 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 1115 your fix is 354°T, 3.4 nm from Mill stack. You steer 305°T at 4.2 kn through the water. At 1225 a new fix puts you 022°T, 2.3 nm from Westfield church spire.

   Plot the 1225 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  

8. At 0915 your fix is 055°T, 3.6 nm from Westfield church spire. You steer 141°T at 6.1 kn through the water. At 1005 a new fix puts you 023°T, 2.6 nm from Mill stack.

   Plot the 1005 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