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VHF 300 Series Owner’s Manual 33
Advanced Operation
4. Select from the following options:
OK—save your changes and return to the previous screen.
CANCEL—remove your changes.
Modifying the Speed Unit of Measurement
You can adjust the unit of measure that is displayed for the speed calculation throughout
the radio. The Speed Over Ground (SOG) on the Home screen will be displayed in the
measurement you select here.
1. Press the MENU key.
2. Select SYSTEM > UNITS > SPEED.
3. Select from the following options:
KNOTS—change the unit of measure to knots.
MPH—change the unit of measure to miles per hour.
KPH—change the unit of measure to kilometers per hour.
Modifying the Heading Display
You can modify the heading to display either true or magnetic calculations. This heading
measurement is displayed throughout the radio including Course Over Ground (COG) on
the Home screen.
1. Press the MENU key.
2. Select SYSTEM > UNITS > HEADING.
3. Select from the following options:
TRUE—change the calculation to reect true north.
MAGNETIC—change the calculation to reect magnetic north.
NOTE: If your radio is congured for NMEA 2000 communication, you cannot select
TRUE or MAGNETIC. Your radio displays AUTO as the setting and displays heading
data based on the information provided over the network (PGN 129026 – COG/SOG, Rapid
Update).
Selecting the Frequency Band
You can switch between the USA, International, or Canadian frequency bands. For a list of
channels available in each frequency band, see pages 36–43.
NOTE: The International frequency band is the only band available for the VHF 300i and
the VHF 300i AIS, unless you have the other bands enabled by an Garmin authorized dealer.
1. Press the MENU key.
2. Select MENU > CHANNEL > FREQUENCY BAND.
3. Use the Channel knob to select USA, INTERNATIONAL, or CANADA.
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