Worksheet 223 · Skill 5

Set and drift

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1. At 0720 your fix is 032°T, 1.7 nm from Westfield church spire. You steer 126°T at 8.7 kn through the water. At 0815 a new fix puts you 256°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 0815 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 0910 your fix is 275°T, 1.1 nm from Gannet Rock daybeacon. You steer 269°T at 5.3 kn through the water. At 1020 a new fix puts you 076°T, 2.3 nm from Westfield church spire.

   Plot the 1020 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 1010 your fix is 068°T, 1.5 nm from Heron Point Light. You steer 080°T at 5.8 kn through the water. At 1045 a new fix puts you 242°T, 2.1 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1505 your fix is 078°T, 3.5 nm from Westfield church spire. You steer 327°T at 4.2 kn through the water. At 1540 a new fix puts you 044°T, 4.4 nm from Westfield church spire.

   Plot the 1540 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 1505 your fix is 241°T, 3.2 nm from Tern Island tower. You steer 107°T at 8.9 kn through the water. At 1555 a new fix puts you 003°T, 1.7 nm from Kittle water tank.

   Plot the 1555 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  

6. At 1210 your fix is 038°T, 3.4 nm from Heron Point Light. You steer 079°T at 8.6 kn through the water. At 1300 a new fix puts you 018°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1300 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  

7. At 0800 your fix is 327°T, 2.0 nm from Tern Island tower. You steer 198°T at 5.8 kn through the water. At 0855 a new fix puts you 003°T, 2.6 nm from Mill stack.

   Plot the 0855 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  

8. At 1035 your fix is 094°T, 1.1 nm from Westfield church spire. You steer 094°T at 4.6 kn through the water. At 1135 a new fix puts you 299°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1135 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn