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Label Name Description Data Type
Fuel (#) Fuel Level The fuel level of the fuel source. Fuel
Hdg Heading
The direction the boat is pointing, measured in degrees. Due to wind
and waves, the boat is often traveling in a slightly different direction
than its heading. See Course Over Ground (see COG).
Vessel
Heat Index Heat Index
The perceived temperature derived from air temperature and relative
humidity.
Environment
Next Turn Next Turn The course of the next route leg with respect to the current heading. Navigation
Odo Odometer The distance traveled. Vessel
Pitch Pitch The rotation angle of the boat from front to back (bow to stern). Vessel
Position (#) GPS
The latitude and longitude coordinates of the vessel position based
on the GPS receiver installation location.
Vessel
Roll Roll The rotation angle of the boat from side to side (port to starboard). Vessel
ROT Rate of Turn The rate at which the boat is turning, measured in degrees per second. Vessel
RPM Revolutions Per Minute The number of engine revolutions per minute. Engine
SMG Speed Made Good
The distance from the starting waypoint on the route divided by the
time elapsed since starting navigation on the route.
Speed
SOG Speed Over Ground
The measurement of the boat’s progress across a given distance
and the speed measurement provided by GPS. SOG is optimal for
navigation because accurate destination times can be derived from
this measurement.
Speed
STW Speed Through Water
The measurement of the flow past the boat, which may vary depending
on current speed and direction.
Speed
Temp (#) Water Temperature The detected water temperature. Environment
Temp (Air) Air Temperature The detected air temperature. Environment
TTG Time to Go
The estimated time required to reach the next waypoint on the route.
TTG is calculated using the SOG (Speed Over Ground) and DTG (Distance
to Go).
Navigation
TWA True Wind Angle The wind angle detected when the vessel is stationary. Wind
TWS True Wind Speed The wind speed detected when the vessel is stationary. Wind
VMG Velocity Made Good The speed of travel relative to the next waypoint on the route. Speed
XTE Cross Track Error
The straight-line distance of the boat from the intended Track. XTE
measures how far the boat is off course.
Navigation
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