Worksheet 562 · Skill 5

Set and drift

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1. At 1335 your fix is 355°T, 3.3 nm from Mill stack. You steer 336°T at 5.8 kn through the water. At 1420 a new fix puts you 302°T, 4.4 nm from Tern Island tower.

   Plot the 1420 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 1020 your fix is 180°T, 1.5 nm from Tern Island tower. You steer 282°T at 8.7 kn through the water. At 1110 a new fix puts you 030°T, 1.4 nm from Westfield church spire.

   Plot the 1110 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  

3. At 0900 your fix is 045°T, 4.1 nm from Gannet Rock daybeacon. You steer 294°T at 6.0 kn through the water. At 0945 a new fix puts you 346°T, 2.3 nm from Tern Island tower.

   Plot the 0945 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  

4. At 1115 your fix is 336°T, 1.4 nm from Tern Island tower. You steer 106°T at 5.7 kn through the water. At 1205 a new fix puts you 029°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1205 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 0945 your fix is 294°T, 2.0 nm from Kittle water tank. You steer 273°T at 6.9 kn through the water. At 1015 a new fix puts you 001°T, 1.7 nm from Mill stack.

   Plot the 1015 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  

6. At 1345 your fix is 058°T, 2.6 nm from Gannet Rock daybeacon. You steer 265°T at 6.2 kn through the water. At 1430 a new fix puts you 257°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1430 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  

7. At 0835 your fix is 358°T, 2.0 nm from Tern Island tower. You steer 229°T at 4.7 kn through the water. At 1005 a new fix puts you 359°T, 1.1 nm from Heron Point Light.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1520 your fix is 244°T, 3.0 nm from Tern Island tower. You steer 114°T at 6.2 kn through the water. At 1555 a new fix puts you 254°T, 2.3 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn