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Determine the TH and the DEV, given:

TC: 183°
WCA: -8°
MH: 170°
CH: 168°

  • A

    TH: 175°
    DEV: -002°

  • B

    TH: 175°
    DEV: +002°

  • C

    TH: 192°
    DEV: -002°

  • D

    TH: 172°
    DEV: +005°

Compass deviation (D): The difference between compass heading (C) and magnetic heading (M).
Magnetic variation (V): The difference between magnetic heading (M) and true heading (T).
Wind correction angle (WCA): The angle used to adjust from true track (TT) to true heading (T) to compensate for wind.
Drift (DR): The difference between true heading (T) and true track (TT).

When converting a compass heading to the true track:

DirectionCDMVTDRTT
→ +E +E +R
→ -W -W -L

Keep in mind the phrase: "West is Best, East is Least," meaning that west corresponds to a plus (+) sign and east to a minus (–) sign.

Given:

  • True Course (Track): 183°C
  • Wind Correction Angle (WCA): -8°, therefore drift = +8°
  • Magnetic Heading: 170°
  • Compass Heading: 168°
DirectionCDMVTDRTT
→168°+2°E170°+5°E175°+8°183°

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