longitude in degrees and minutes, with options for degrees,
minutes and second, degrees only, or one of several grid
formats.
Map datum is a math model which depicts a part of the surface
of the earth. Latitude and longitude lines on a paper map are
referenced to a specific map datum.
1
Find out which map datum and position format was used
when the original waypoint was created.
If the original waypoint was taken from a map, there should
be a legend on the map that lists the map datum and position
format used to create that map. Most often this is found near
the map key.
2
On the chartplotter, select Settings > Units.
3
Select the correct map datum and position format settings.
4
Create the waypoint again.
NMEA 0183 Information
Type
Sentence
Transmit
GPAPB
GPBOD
GPBWC
GPGGA
GPGLL
GPGSA
GPGSV
GPRMB
GPRMC
GPRTE
GPVTG
GPWPL
GPXTE
PGRME
PGRMM
PGRMZ
SDDBT
SDDPT
SDMTW
SDVHW
Receive
DPT
DBT
MTW
VHW
WPL
DSC
DSE
HDG
HDM
MWD
MDA
MWV
22
Description
APB: Heading or track controller
(autopilot) sentence "B"
BOD: Bearing (origin to
destination)
BWC: Bearing and distance to
waypoint
GGA: Global positioning system
fix data
GLL: Geographic position
(latitude and longitude)
GSA: GNSS DOP and active
satellites
GSV: GNSS satellites in view
RMB: Recommended minimum
navigation information
RMC: Recommended minimum
specific GNSS data
RTE: Routes
VTG: Course over ground and
ground speed
WPL: Waypoint location
XTE: Cross track error
E: Estimated error
M: Map datum
Z: Altitude
DBT: Depth below transducer
DPT: Depth
MTW: Water temperature
VHW: Water speed and heading
Depth
Depth below transducer
Water temperature
Water speed and heading
Waypoint location
Digital selective calling
information
Expanded digital selective calling
Heading, deviation, and variation
Heading, magnetic
Wind direction and speed
Meteorological composite
Wind speed and angle
Type
Sentence
VDM
You can purchase complete information about National Marine
Electronics Association (NMEA) format and sentences from: NMEA,
Seven Riggs Avenue, Severna Park, MD 21146 USA (www.nmea.org)
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Description
AIS VHF data-link message
Appendix
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