Worksheet 210 · Skill 5

Set and drift

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1. At 1140 your fix is 264°T, 2.7 nm from Gannet Rock daybeacon. You steer 286°T at 4.0 kn through the water. At 1220 a new fix puts you 030°T, 2.7 nm from Heron Point Light.

   Plot the 1220 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  

2. At 1235 your fix is 032°T, 2.9 nm from Heron Point Light. You steer 126°T at 6.0 kn through the water. At 1325 a new fix puts you 024°T, 1.7 nm from Mill stack.

   Plot the 1325 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  

3. At 1155 your fix is 028°T, 1.3 nm from Heron Point Light. You steer 083°T at 4.5 kn through the water. At 1305 a new fix puts you 215°T, 1.2 nm from Gannet Rock daybeacon.

   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  

4. At 1600 your fix is 246°T, 2.7 nm from Tern Island tower. You steer 126°T at 5.7 kn through the water. At 1700 a new fix puts you 016°T, 1.5 nm from Kittle water tank.

   Plot the 1700 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  

5. At 1335 your fix is 054°T, 2.1 nm from Gannet Rock daybeacon. You steer 246°T at 5.1 kn through the water. At 1450 a new fix puts you 067°T, 2.9 nm from Heron Point Light.

   Plot the 1450 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  

6. At 1315 your fix is 268°T, 1.5 nm from Tern Island tower. You steer 228°T at 5.0 kn through the water. At 1400 a new fix puts you 336°T, 1.9 nm from Heron Point Light.

   Plot the 1400 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  

7. At 1105 your fix is 135°T, 1.9 nm from Westfield church spire. You steer 016°T at 4.9 kn through the water. At 1155 a new fix puts you 056°T, 2.2 nm from Westfield church spire.

   Plot the 1155 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  

8. At 0725 your fix is 225°T, 3.4 nm from Tern Island tower. You steer 270°T at 5.5 kn through the water. At 0800 a new fix puts you 148°T, 1.7 nm from Westfield church spire.

   Plot the 0800 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