Humminbird Matrix 20 - Manual (Page 52)

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Speed Calibration
(Advanced, with Temp/Speed Only)
Speed Calibration will adjust the speed readout by the percentage entered, and will appear
in the menu if a Temp/Speed Accessory is connected and the paddlewheel has moved at
least once, when the unit is in Advanced User Mode (see Setup Menu Tab: User Mode.)
To change the Speed Calibration setting:
1. Make sure you are in Advanced User Mode, then highlight Speed Calibration
on the Setup menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Speed
Calibration setting. (-20% to +20%, Default = 0%)
NMEA Output
(Advanced)
NMEA Output turns the NMEA output on or off. This menu choice is available only
when in Advanced User Mode (see Setup Menu Tab: User Mode.)
The following NMEA sentences are output:
DPT- Depth
MTW - Water Temperature
GLL - Lat/Lon Position
GGA - GPS Fix Data
RMC - Recommended Minimum Specific GNSS Data
VTG - Course Over Ground and Ground Speed
ZDA - Time and Date
When navigating, the following NMEA sentences are also output:
APB - Autopilot Sentence B
BWR - Bearing and Distance to Waypoint
RMB - Recommended Minimum Navigation Info
To turn NMEA Output on or off:
1. Make sure you are in Advanced User Mode, then highlight NMEA Output on
the Setup menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the NMEA
Output to On or Off (On, Off, Default = Off).