Worksheet 269 · Skill 5

Set and drift

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1. At 1235 your fix is 065°T, 2.5 nm from Westfield church spire. You steer 136°T at 6.3 kn through the water. At 1305 a new fix puts you 241°T, 2.8 nm from Tern Island tower.

   Plot the 1305 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  

2. At 1210 your fix is 351°T, 2.6 nm from Mill stack. You steer 083°T at 6.8 kn through the water. At 1245 a new fix puts you 146°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1245 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 1545 your fix is 358°T, 2.4 nm from Mill stack. You steer 041°T at 4.0 kn through the water. At 1625 a new fix puts you 163°T, 1.5 nm from Tern Island tower.

   Plot the 1625 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 0955 your fix is 022°T, 1.9 nm from Mill stack. You steer 088°T at 7.0 kn through the water. At 1035 a new fix puts you 035°T, 2.6 nm from Kittle water tank.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1325 your fix is 224°T, 0.9 nm from Gannet Rock daybeacon. You steer 278°T at 7.2 kn through the water. At 1425 a new fix puts you 359°T, 1.6 nm from Heron Point Light.

   Plot the 1425 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  

6. At 1240 your fix is 030°T, 2.4 nm from Westfield church spire. You steer 121°T at 4.4 kn through the water. At 1345 a new fix puts you 008°T, 2.7 nm from Mill stack.

   Plot the 1345 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  

7. At 1245 your fix is 009°T, 1.8 nm from Kittle water tank. You steer 046°T at 4.0 kn through the water. At 1315 a new fix puts you 067°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1315 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  

8. At 0920 your fix is 226°T, 1.6 nm from Gannet Rock daybeacon. You steer 309°T at 5.2 kn through the water. At 0955 a new fix puts you 222°T, 1.9 nm from Tern Island tower.

   Plot the 0955 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