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Glossary
GLOSSARY
Azimuth - The angle from
the horizon to a satellite or
other object.
Bearing (BRG) - Compass
direction (0°÷360°) from the
boat’s position to destination.
COG - Course Over Ground
Direction of movement
relative to the ground.
Coordinates - Description of
position in terms of latitude
and longitude.
Fix - Geographical position
computed by the GPS.
GMT - Greenwich Mean
Time (GMT) (Universal Time).
GPS - Global Positioning
System
The constellation of
navigation satellites that
orbit the earth transmit
precise time and position
information. A GPS receiver
uses this information to
triangulate a position fix.
Each GPS satellite transmits
its precise location and the
time when the transmission
started. A GPS receiver
acquires the signal and
measures the interval
between transmission and
reception to determine the
distance between the
receiver and the satellite.
Once the receiver has
computed the range for at
least 3 satellites, the boat’s
position can be determined.
Heading - The direction the
boat is moving to.
Leg - A segment of a route
between waypoints.
SOG - Speed Over Ground
Boat’s speed with respect to
the earth.
Waypoint - A significant
position in the route (often
where a turn is made).