Worksheet 846 · Skill 5

Set and drift

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1. At 1130 your fix is 013°T, 3.5 nm from Westfield church spire. You steer 109°T at 4.3 kn through the water. At 1250 a new fix puts you 238°T, 3.2 nm from Tern Island tower.

   Plot the 1250 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0930 your fix is 105°T, 2.0 nm from Westfield church spire. You steer 042°T at 5.4 kn through the water. At 1015 a new fix puts you 318°T, 2.8 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1135 your fix is 278°T, 2.6 nm from Tern Island tower. You steer 129°T at 4.1 kn through the water. At 1230 a new fix puts you 215°T, 2.1 nm from Tern Island tower.

   Plot the 1230 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  

4. At 1545 your fix is 296°T, 1.4 nm from Gannet Rock daybeacon. You steer 189°T at 5.8 kn through the water. At 1620 a new fix puts you 062°T, 2.6 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1520 your fix is 079°T, 1.1 nm from Westfield church spire. You steer 086°T at 6.6 kn through the water. At 1550 a new fix puts you 267°T, 3.0 nm from Tern Island tower.

   Plot the 1550 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 0715 your fix is 045°T, 1.6 nm from Westfield church spire. You steer 097°T at 6.6 kn through the water. At 0750 a new fix puts you 264°T, 2.8 nm from Tern Island tower.

   Plot the 0750 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  

7. At 0735 your fix is 003°T, 1.0 nm from Westfield church spire. You steer 069°T at 7.2 kn through the water. At 0805 a new fix puts you 051°T, 3.7 nm from Westfield church spire.

   Plot the 0805 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 1430 your fix is 343°T, 1.3 nm from Heron Point Light. You steer 078°T at 7.9 kn through the water. At 1500 a new fix puts you 224°T, 3.2 nm from Tern Island tower.

   Plot the 1500 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