Worksheet 100 · Skill 5

Set and drift

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1. At 1025 your fix is 224°T, 1.6 nm from Tern Island tower. You steer 205°T at 8.5 kn through the water. At 1055 a new fix puts you 310°T, 2.0 nm from Mill stack.

   Plot the 1055 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 1055 your fix is 069°T, 2.4 nm from Heron Point Light. You steer 092°T at 7.3 kn through the water. At 1130 a new fix puts you 286°T, 2.1 nm from Kittle water tank.

   Plot the 1130 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 0910 your fix is 261°T, 2.0 nm from Gannet Rock daybeacon. You steer 288°T at 4.9 kn through the water. At 0955 a new fix puts you 263°T, 3.2 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1310 your fix is 208°T, 2.4 nm from Tern Island tower. You steer 067°T at 5.0 kn through the water. At 1410 a new fix puts you 027°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1410 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  

5. At 1310 your fix is 048°T, 3.9 nm from Gannet Rock daybeacon. You steer 303°T at 4.3 kn through the water. At 1345 a new fix puts you 065°T, 2.6 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1520 your fix is 054°T, 1.8 nm from Kittle water tank. You steer 330°T at 6.5 kn through the water. At 1615 a new fix puts you 018°T, 2.4 nm from Tern Island tower.

   Plot the 1615 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  

7. At 0940 your fix is 303°T, 1.6 nm from Gannet Rock daybeacon. You steer 280°T at 6.3 kn through the water. At 1015 a new fix puts you 247°T, 3.0 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1125 your fix is 279°T, 1.6 nm from Gannet Rock daybeacon. You steer 278°T at 5.2 kn through the water. At 1235 a new fix puts you 097°T, 1.0 nm from Westfield church spire.

   Plot the 1235 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