© Noel Griffin 2003-2005
GPS Units Calculate
«LOCATION (Long & Lat)
ØAccurate to 6 meters (3m with DGPS)
«SPEED
ØSOG – Speed of boat over ground
•Not same as boat speed thru water (i.e. log)
•Effected by river current or tide
«TRACK
ØCOG – Course over ground
•Not necessarily same as boat heading
•Effected by wind, river/lake current, or tide
«BEARING & DISTANCE
ØBRG - To Next Waypoint
«CROSS TRACK ERROR
ØXTE - Distance Off Course
Text Box: Track 025oT
Track 025oT
Text Box: Course 015oT
Course 015oT
Striped Right Arrow: 2kt Tide
2kt Tide
Text Box: COG 025oT
COG 025oT
Water Speed = 7kt
SOG = 5.2kt
Striped Right Arrow: Wind
Wind