Worksheet 309 · Skill 5

Set and drift

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1. At 1245 your fix is 333°T, 1.0 nm from Kittle water tank. You steer 005°T at 5.6 kn through the water. At 1325 a new fix puts you 031°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1325 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 1000 your fix is 337°T, 1.1 nm from Kittle water tank. You steer 279°T at 8.5 kn through the water. At 1035 a new fix puts you 352°T, 3.0 nm from Mill stack.

   Plot the 1035 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  

3. At 0935 your fix is 213°T, 3.3 nm from Tern Island tower. You steer 302°T at 4.3 kn through the water. At 1025 a new fix puts you 059°T, 2.4 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1415 your fix is 337°T, 1.6 nm from Kittle water tank. You steer 021°T at 7.9 kn through the water. At 1505 a new fix puts you 063°T, 4.3 nm from Tern Island tower.

   Plot the 1505 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  

5. At 0830 your fix is 013°T, 1.7 nm from Tern Island tower. You steer 254°T at 7.1 kn through the water. At 0905 a new fix puts you 071°T, 3.4 nm from Westfield church spire.

   Plot the 0905 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  

6. At 1505 your fix is 080°T, 2.1 nm from Heron Point Light. You steer 356°T at 4.7 kn through the water. At 1620 a new fix puts you 044°T, 4.6 nm from Westfield church spire.

   Plot the 1620 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  

7. At 1230 your fix is 216°T, 2.7 nm from Tern Island tower. You steer 067°T at 5.1 kn through the water. At 1310 a new fix puts you 039°T, 1.8 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0945 your fix is 025°T, 1.1 nm from Heron Point Light. You steer 120°T at 4.2 kn through the water. At 1020 a new fix puts you 315°T, 1.3 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn