Appendix: Glossary - Raymarine A65 Owner's Handbook Manual

Appendix: Glossary

Leg
Longitude
Man
MPH
National Marine
Electronics Association
(NMEA)
nm
NMEA
North Up Orientation
Paddlewheel Speed
Range
Route
RTE
s
sm
SOG
Speed Over Ground
(SOG)
Time To Go (TTG)
Time Variable Gain
(TVG)
TTG
TVG
One portion of a route, consisting of starting and destination
waypoints.
Position east or west of the prime meridian, measured in degrees.
Manual
Miles per hour
A US standards committee that defines electrical and data
specifications for communications between marine electronics.
NMEA standards provide protocols by which marine instruments
and also most GPS receivers can communicate with each other.
Nautical Mile
National Marine Electronics Association
Displays the chart orientation with true north upwards. As your
heading changes the boat symbol moves accordingly. This is the
default mode for the chart application.
See 'Boat Speed'
Distance to the specified waypoint.
A sequential series of waypoints entered into the chartplotter that
direct the boat to the desired destination.
Route
seconds
Statute Miles
Speed Over Ground
The actual speed the boat is moving, as measured by the GPS. This
measurement differs from paddlewheel speed, which does not take
into account current, wind or other sea conditions.
Estimated time that will elapse before reaching waypoint, at the
current course and speed.
A DSM gain setting that reduces clutter by varying the gain
throughout the water column This function is useful for reducing the
appearance of 'noise'.
Time To Go
Time Variable Gain
95