Worksheet 693 · Skill 5

Set and drift

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1. At 0720 your fix is 247°T, 2.8 nm from Gannet Rock daybeacon. You steer 289°T at 4.6 kn through the water. At 0755 a new fix puts you 041°T, 2.7 nm from Heron Point Light.

   Plot the 0755 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  

2. At 1225 your fix is 043°T, 2.3 nm from Heron Point Light. You steer 131°T at 6.3 kn through the water. At 1255 a new fix puts you 105°T, 3.6 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1145 your fix is 157°T, 1.5 nm from Gannet Rock daybeacon. You steer 274°T at 6.2 kn through the water. At 1235 a new fix puts you 012°T, 2.5 nm from Mill stack.

   Plot the 1235 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  

4. At 0840 your fix is 235°T, 1.8 nm from Tern Island tower. You steer 163°T at 8.4 kn through the water. At 0910 a new fix puts you 035°T, 2.2 nm from Mill stack.

   Plot the 0910 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  

5. At 1130 your fix is 086°T, 3.5 nm from Westfield church spire. You steer 185°T at 4.9 kn through the water. At 1210 a new fix puts you 305°T, 3.6 nm from Mill stack.

   Plot the 1210 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  

6. At 1230 your fix is 050°T, 2.9 nm from Heron Point Light. You steer 106°T at 4.8 kn through the water. At 1330 a new fix puts you 305°T, 1.7 nm from Kittle water tank.

   Plot the 1330 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  

7. At 0835 your fix is 242°T, 3.4 nm from Tern Island tower. You steer 040°T at 5.1 kn through the water. At 0915 a new fix puts you 329°T, 2.2 nm from Tern Island tower.

   Plot the 0915 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 1240 your fix is 228°T, 3.4 nm from Tern Island tower. You steer 070°T at 8.6 kn through the water. At 1320 a new fix puts you 044°T, 3.0 nm from Gannet Rock daybeacon.

   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