Worksheet 131 · Skill 5

Set and drift

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1. At 1235 your fix is 047°T, 1.7 nm from Kittle water tank. You steer 276°T at 7.0 kn through the water. At 1325 a new fix puts you 003°T, 1.8 nm from Mill stack.

   Plot the 1325 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  

2. At 1325 your fix is 054°T, 1.6 nm from Tern Island tower. You steer 152°T at 4.2 kn through the water. At 1455 a new fix puts you 024°T, 2.4 nm from Kittle water tank.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1150 your fix is 029°T, 2.2 nm from Gannet Rock daybeacon. You steer 186°T at 6.3 kn through the water. At 1220 a new fix puts you 335°T, 1.5 nm from Kittle water tank.

   Plot the 1220 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 1405 your fix is 033°T, 2.5 nm from Kittle water tank. You steer 270°T at 8.6 kn through the water. At 1445 a new fix puts you 354°T, 2.7 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0750 your fix is 071°T, 2.8 nm from Gannet Rock daybeacon. You steer 337°T at 5.4 kn through the water. At 0835 a new fix puts you 063°T, 2.3 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1025 your fix is 194°T, 2.3 nm from Tern Island tower. You steer 339°T at 4.8 kn through the water. At 1055 a new fix puts you 270°T, 1.8 nm from Tern Island tower.

   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  

7. At 0815 your fix is 041°T, 4.6 nm from Gannet Rock daybeacon. You steer 203°T at 5.0 kn through the water. At 0855 a new fix puts you 091°T, 2.9 nm from Gannet Rock daybeacon.

   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  

8. At 1220 your fix is 052°T, 4.2 nm from Westfield church spire. You steer 130°T at 5.8 kn through the water. At 1250 a new fix puts you 217°T, 1.7 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn