Worksheet 455 · Skill 5

Set and drift

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1. At 0830 your fix is 121°T, 1.6 nm from Gannet Rock daybeacon. You steer 008°T at 4.0 kn through the water. At 0955 a new fix puts you 066°T, 3.8 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1425 your fix is 060°T, 2.6 nm from Heron Point Light. You steer 126°T at 5.9 kn through the water. At 1500 a new fix puts you 241°T, 2.6 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1355 your fix is 263°T, 3.2 nm from Gannet Rock daybeacon. You steer 330°T at 8.6 kn through the water. At 1435 a new fix puts you 289°T, 3.6 nm from Tern Island tower.

   Plot the 1435 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  

4. At 0835 your fix is 005°T, 3.1 nm from Mill stack. You steer 330°T at 5.2 kn through the water. At 0930 a new fix puts you 060°T, 3.5 nm from Westfield church spire.

   Plot the 0930 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  

5. At 1555 your fix is 044°T, 1.6 nm from Kittle water tank. You steer 290°T at 8.4 kn through the water. At 1630 a new fix puts you 194°T, 2.4 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  

6. At 1020 your fix is 039°T, 4.2 nm from Gannet Rock daybeacon. You steer 235°T at 4.8 kn through the water. At 1115 a new fix puts you 263°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1115 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 1210 your fix is 085°T, 1.9 nm from Westfield church spire. You steer 041°T at 5.5 kn through the water. At 1255 a new fix puts you 304°T, 3.8 nm from Tern Island tower.

   Plot the 1255 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  

8. At 0910 your fix is 096°T, 2.9 nm from Westfield church spire. You steer 144°T at 5.5 kn through the water. At 0945 a new fix puts you 341°T, 2.7 nm from Mill stack.

   Plot the 0945 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