Worksheet 502 · Skill 5

Set and drift

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1. At 1035 your fix is 051°T, 3.5 nm from Tern Island tower. You steer 165°T at 5.4 kn through the water. At 1150 a new fix puts you 310°T, 1.2 nm from Kittle water tank.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1520 your fix is 028°T, 3.5 nm from Heron Point Light. You steer 304°T at 4.4 kn through the water. At 1600 a new fix puts you 029°T, 2.9 nm from Westfield church spire.

   Plot the 1600 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 0755 your fix is 004°T, 1.7 nm from Westfield church spire. You steer 066°T at 5.7 kn through the water. At 0825 a new fix puts you 030°T, 3.2 nm from Westfield church spire.

   Plot the 0825 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 0830 your fix is 290°T, 1.4 nm from Tern Island tower. You steer 199°T at 6.3 kn through the water. At 0905 a new fix puts you 069°T, 2.1 nm from Heron Point Light.

   Plot the 0905 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 0910 your fix is 069°T, 1.9 nm from Gannet Rock daybeacon. You steer 218°T at 5.4 kn through the water. At 0955 a new fix puts you 277°T, 2.6 nm from Kittle water tank.

   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  

6. At 1555 your fix is 102°T, 2.2 nm from Westfield church spire. You steer 094°T at 8.4 kn through the water. At 1630 a new fix puts you 191°T, 1.3 nm from Tern Island tower.

   Plot the 1630 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 1325 your fix is 060°T, 2.3 nm from Westfield church spire. You steer 341°T at 4.0 kn through the water. At 1355 a new fix puts you 033°T, 2.2 nm from Westfield church spire.

   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  

8. At 0800 your fix is 242°T, 1.0 nm from Gannet Rock daybeacon. You steer 032°T at 7.3 kn through the water. At 0840 a new fix puts you 070°T, 3.0 nm from Tern Island tower.

   Plot the 0840 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