Worksheet 198 · Skill 5

Set and drift

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1. At 1545 your fix is 270°T, 1.1 nm from Gannet Rock daybeacon. You steer 237°T at 4.0 kn through the water. At 1640 a new fix puts you 042°T, 2.1 nm from Mill stack.

   Plot the 1640 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  

2. At 1010 your fix is 049°T, 1.6 nm from Kittle water tank. You steer 298°T at 5.8 kn through the water. At 1050 a new fix puts you 274°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1050 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  

3. At 1400 your fix is 024°T, 2.3 nm from Heron Point Light. You steer 006°T at 4.1 kn through the water. At 1500 a new fix puts you 060°T, 3.8 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0935 your fix is 013°T, 2.3 nm from Mill stack. You steer 270°T at 5.2 kn through the water. At 1015 a new fix puts you 142°T, 3.6 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1410 your fix is 100°T, 1.6 nm from Tern Island tower. You steer 102°T at 6.8 kn through the water. At 1440 a new fix puts you 077°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1440 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 1230 your fix is 061°T, 2.0 nm from Heron Point Light. You steer 042°T at 4.2 kn through the water. At 1310 a new fix puts you 227°T, 1.5 nm from Tern Island tower.

   Plot the 1310 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  

7. At 1155 your fix is 012°T, 2.8 nm from Westfield church spire. You steer 095°T at 5.1 kn through the water. At 1305 a new fix puts you 349°T, 1.4 nm from Tern Island tower.

   Plot the 1305 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  

8. At 1325 your fix is 198°T, 1.5 nm from Tern Island tower. You steer 224°T at 4.9 kn through the water. At 1355 a new fix puts you 221°T, 3.2 nm from Tern Island tower.

   Plot the 1355 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