Raymarine E120W Reference Manual page 251

Chapter 15: System setup and customizing
This screen provides, for each tracked satellite, the satellite number, a graphical signal
strength bar, status, azimuth angle and its elevation angle from your vessel. The sky
view graphic shows the position of these satellites.
Actual mode
GPS reporting
(No Fix, Fix, D
Fix or SD Fix)
ON
Positional accuracy is dependent upon these parameters; in particular, the azimuth
and elevation angles are used in a triangulation process to calculate your position.
Horizontal Dilution of Position (HDOP) is a measure of this accuracy; a higher figure
signifies a greater positional error. In ideal circumstances, the figure should be in the
region of 1.0.
Selecting the satellite differential system
You should select the satellite group(s) appropriate to your area, via the Other Set Up
soft key:
• WAAS - United States
• EGNOS - Europe
• MSAS - Japan
• GAGAN - India
Note: The EGNOS, MSAS and GAGAN systems may not currently be active. Check with
your local government for operational status.
OTHER SET UP
DIFF GPS
OFF
Only available if connected to
Raymarine landbased GPS e.g. 114
GPS Setup Menu
Datus
COG/SOG Filter
WAAS
EGNOS
MSAS
GAGAN
DIFF SET UP OTHER SET UP
WGX 1984
Medium
ON
OFF
OFF
DIFF SET UP OFF
Highlight satellite
group
Select group
235
Mode
selected
by GPS
RESTART GPS
ON
OK
OFF
Highlight
ON or OFF as
appropriate