Worksheet 318 · Skill 5

Set and drift

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1. At 1040 your fix is 083°T, 2.0 nm from Westfield church spire. You steer 103°T at 6.8 kn through the water. At 1125 a new fix puts you 331°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1125 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  

2. At 0955 your fix is 221°T, 1.5 nm from Gannet Rock daybeacon. You steer 061°T at 6.4 kn through the water. At 1025 a new fix puts you 101°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1025 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  

3. At 1240 your fix is 026°T, 1.2 nm from Heron Point Light. You steer 128°T at 4.7 kn through the water. At 1320 a new fix puts you 018°T, 1.8 nm from Mill stack.

   Plot the 1320 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 0745 your fix is 015°T, 2.3 nm from Heron Point Light. You steer 133°T at 4.3 kn through the water. At 0820 a new fix puts you 333°T, 1.8 nm from Mill stack.

   Plot the 0820 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 1205 your fix is 058°T, 4.4 nm from Tern Island tower. You steer 250°T at 4.6 kn through the water. At 1255 a new fix puts you 312°T, 2.2 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0945 your fix is 344°T, 1.5 nm from Gannet Rock daybeacon. You steer 096°T at 6.6 kn through the water. At 1015 a new fix puts you 077°T, 3.0 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1200 your fix is 259°T, 2.6 nm from Gannet Rock daybeacon. You steer 257°T at 6.9 kn through the water. At 1230 a new fix puts you 055°T, 2.7 nm from Heron Point Light.

   Plot the 1230 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 0745 your fix is 234°T, 2.6 nm from Tern Island tower. You steer 186°T at 4.9 kn through the water. At 0820 a new fix puts you 003°T, 1.4 nm from Mill stack.

   Plot the 0820 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