From the Home screen, select Configure > Units > System Units > Custom.
2. Complete an action:
• Select Depth, and select Feet, Fathoms, or Meters.
• Select Temperature, and select Fahrenheit (oF) or Celsius (oC).
• Select Distance, and select Miles, Kilometers, Nautical (nm, ft) or Nautical (nm, m).
• Select Speed > Vessel Speed, and select Miles Per Hour, Kilometers Per Hour, or Knots.
• Select Speed > Wind Speed, and select Miles Per Hour, Meters Per Sec, or Knots.
• Select elevation, and select Feet or Meters.
• Select Volume, and select Litres, US Gallons, or UK Gallons.
• Select Pressure > Gauge Pressure, and select kPa or psi.
• Select Pressure > Atmospheric Pressure, and select Millibars or Inches of Mercur