Garmin GNX 21 Owner's Manual - Page 7

Browse online or download pdf Owner's Manual for Marine Equipment Garmin GNX 21. Garmin GNX 21 10 pages. Gps navigation
Also for Garmin GNX 21: Owner's Manual (10 pages), Installation Instructions (4 pages), Installation Instructions (4 pages), Installation Instructions (4 pages)

Print Page
Garmin GNX 21 Owner's Manual
NMEA 0183 Data Type Information
Each NMEA certified sensor provides unique information to the
NMEA certified display device, such as the GNX 20/21. The
data you can view on your display depends on the sensors you
have installed and configured. See the General NMEA Data
Type Requirements topic in the Technical Reference for Garmin
NMEA Products manual at www.garmin.com/support.

Registering Your Device

Help us better support you by completing our online registration
today.
• Go to http://my.garmin.com.
• Keep the original sales receipt, or a photocopy, in a safe
place.
Appendix

Data Fields

ABS: Absolute, relative to another data field. For example,
absolute humidity.
AIR: The air temperature.
AVG: The average amount.
AWA: The wind angle measured relative to the bow of the
vessel.
AWS: The measured speed of the wind.
BAR: The calibrated current pressure.
BAT: The battery voltage.
BSP: The speed of the boat relative to the water.
BTW: The direction from your current location to a destination.
You must be navigating for this data to appear.
COG: The actual direction of travel, regardless of the course
steered and temporary variations in heading.
CTS: The direction in which you must steer to return to the
course set at the start of navigation.
DIS: The distance traveled for the current track or activity.
DPT: The depth of the water. Your device must be connected to
a NMEA 0183 or NMEA 2000 device capable of acquiring the
water depth.
DRF: The speed of the current.
DTW: The distance to the waypoint.
ELV: The altitude of your current location above or below sea
level.
ERR: The precision of the current position, when used with
GPS.
GWD: The direction of the wind relative to the ground,
referenced from the north.
GWS: The speed of the wind relative to the ground.
HDG: The direction the boat is pointing.
HUM: The level of humidity.
MAX: The maximum in relation to another data field. For
example, maximum speed.
MIN: The minimum in relation to another data field. For example,
minimum speed.
ODO: A running tally of distance traveled for all trips. This total
does not clear when resetting the trip data.
OTH: The opposite tack direction of the vessel based on the
current tack direction.
POS: The vessel's current position.
RACE: The timer for vessel racing.
REF: A steer pilot reference.
Appendix
REL: Relative to another data field. For example, relative
humidity.
RUD: The rudder relative to another data field. For example,
rudder angle.
SEA: The temperature of the water.
®
SOG: The actual speed of travel, regardless of the course
steered and temporary variations in heading.
STR: The steer pilot.
TRP: A running tally of the distance traveled since the last reset.
TWA: The angle of the wind relative to the water, referenced
from the bow of the boat with a port or starboard angle up to
180 degrees.
TWD: The true direction of the wind relative to north.
TWS: The true speed of the wind relative to the vessel.
UTC: The Coordinated Universal Time.
VMG: The speed at which you are closing on a destination along
a route. You must be navigating for this data to appear.
WND: The velocity made good upwind.
XTE: A cross track error.
3