Table of Contents
Advertisement
Advanced l{avigation Guide
Thc Star Pilot is designed to be the easiest to use GPS system
available today. The prevrous sections of the operation manual have
detailed the basics of installation and operation of the Star Pilot. To
utilize the system to its optimum. the following section on naviqation
should be studied. By becoming more familiar with these naviga-
tional and GPS terms and concepts. you will increase your own
navigational skills.
GPS Modes
The Star Pilot operates in an automatic GPS Mode. When three
satellites are avilable, 2D fixes for latitude and longitude are given.
If four satellites are available, 3D fixes for latitude. longitude and
altitude are given.
LATITUDE/LONGITUDE (LAT/LON) Latitude iS the diStance
measured in degrees North and South of the equator. Longitude is the
distance measured in degrees West and East of the prime meridian at
Greenwich, England.
SPEED OVER GROUND (SOG) This is the true speed calculated
from the time and distance over the ground you have travelled. SOG
does not consider water speed or destination fbr its calculations.
COURSE OVER GROUND (COG) This is the true course over
the ground that you arc currently headed.
CROSS TRACK ERROR (XTE) This is the distance of your boat,
either left or right. from the desired track (start point to destination).
ESTIMATED TIME of ARRIVAL (ETA) This is an estimate
based on the current time and your TIME TO GO (TTG).
TIME TO (;0 (TTG) This is calculated from the current distance to
your destination and your VELOCITY MADE GOOD (VMG).
VELOCITY MADE GOOD (VMG) This is the portion of your
boat's speed that is parallel to your desired track (start point to
destination). VMG is especially useful for sailing boats where closing
speed on the desired waypoint is displayed regardless of course or
bearing changes (tacking) made enroute.
DISTANCE MADE GOOD (DMG) This is the portion of the
distance your boat has travelled that is parallel to your desired track
(start point to destination).
N (True or magnetic)
coG
+
V M G
I
START
P O I N T
I
DESTINATION
t
x
i
2 l
Advertisement
Table of Contents
