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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
+
VMG
I
START
POINT
I
DESTINATION
t
x
i
2l