Worksheet 146 · Skill 5

Set and drift

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1. At 0955 your fix is 097°T, 3.1 nm from Westfield church spire. You steer 046°T at 8.1 kn through the water. At 1025 a new fix puts you 287°T, 1.9 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0705 your fix is 044°T, 2.5 nm from Tern Island tower. You steer 097°T at 6.0 kn through the water. At 0735 a new fix puts you 063°T, 4.6 nm from Tern Island tower.

   Plot the 0735 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  

3. At 1500 your fix is 026°T, 3.0 nm from Heron Point Light. You steer 139°T at 4.5 kn through the water. At 1545 a new fix puts you 038°T, 1.9 nm from Mill stack.

   Plot the 1545 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 1140 your fix is 286°T, 1.7 nm from Tern Island tower. You steer 296°T at 5.3 kn through the water. At 1210 a new fix puts you 043°T, 3.5 nm from Westfield church spire.

   Plot the 1210 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 0840 your fix is 013°T, 2.1 nm from Tern Island tower. You steer 266°T at 6.9 kn through the water. At 0945 a new fix puts you 042°T, 3.8 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0805 your fix is 044°T, 2.4 nm from Tern Island tower. You steer 166°T at 5.2 kn through the water. At 0835 a new fix puts you 026°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 0835 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 0755 your fix is 034°T, 2.6 nm from Mill stack. You steer 038°T at 4.1 kn through the water. At 0825 a new fix puts you 273°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0825 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 0820 your fix is 217°T, 1.7 nm from Gannet Rock daybeacon. You steer 108°T at 4.4 kn through the water. At 0900 a new fix puts you 128°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0900 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