Worksheet 42 · Skill 5

Set and drift

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1. At 1230 your fix is 213°T, 1.4 nm from Gannet Rock daybeacon. You steer 296°T at 6.4 kn through the water. At 1330 a new fix puts you 049°T, 2.7 nm from Westfield church spire.

   Plot the 1330 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  

2. At 0945 your fix is 308°T, 1.5 nm from Kittle water tank. You steer 295°T at 5.6 kn through the water. At 1015 a new fix puts you 025°T, 2.4 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  

3. At 1425 your fix is 238°T, 1.6 nm from Tern Island tower. You steer 261°T at 5.0 kn through the water. At 1455 a new fix puts you 090°T, 3.2 nm from Westfield church spire.

   Plot the 1455 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  

4. At 1040 your fix is 302°T, 1.8 nm from Kittle water tank. You steer 302°T at 7.5 kn through the water. At 1150 a new fix puts you 067°T, 2.7 nm from Westfield church spire.

   Plot the 1150 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1050 your fix is 072°T, 2.5 nm from Tern Island tower. You steer 301°T at 4.7 kn through the water. At 1125 a new fix puts you 021°T, 1.8 nm from Tern Island tower.

   Plot the 1125 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 1340 your fix is 358°T, 1.5 nm from Heron Point Light. You steer 108°T at 4.4 kn through the water. At 1445 a new fix puts you 267°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1445 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 1505 your fix is 089°T, 1.6 nm from Heron Point Light. You steer 082°T at 4.9 kn through the water. At 1635 a new fix puts you 196°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1635 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 0815 your fix is 304°T, 3.7 nm from Tern Island tower. You steer 208°T at 6.5 kn through the water. At 0855 a new fix puts you 075°T, 2.1 nm from Westfield church spire.

   Plot the 0855 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