8 Chapter 2 Geode Features
Geode GNS3 Real-Time Sub-Meter GPS Receiver
The Global Positioning System
(GPS) is the United States
government’s navigation
satellite constellation.
As of June 2021, the GPS
constellation consists of 31
operational satellites. You can
view six or more GPS satellites
from virtually any point on the
planet. The US government
has stated that it is committed
to maintaining the availability
of at least 27 GPS satellites 95%
of the time.
The standard configuration
for the Geode is that of a GPS
receiver. This means that it
receives positioning data from
the US government’s GPS
constellation of satellites. In
order to calculate an accurate position, the Geode (or any
GPS receiver) needs a direct line of sight with at least four
satellites. Without that fourth satellite, the receiver has to
estimate altitude which can affect horizontal accuracy by
hundreds of meters. This is not likely to be a problem if you
are collecting data in an open, flat landscape. However,
if you are collecting data in the mountains, under heavy
canopy, or in a city scape, physical obstructions may make
it difficult to view four satellites in the GPS constellation
simultaneously.
This is why the Geode also comes with GNSS. GNSS stands
for Global Navigation Satellite System, and it encompasses
all global satellite constellations from various countries
and unions. Specifically, the Geode can receive positioning
data from the following satellite constellations: GPS (US),
GLONASS (Russia), GALILEO (European Union), BeiDou
(China).
With the Multi-GNSS configuration, the number of satellites
available at any given moment is multiplied. This greatly
increases the likelihood that your Geode will be able to get
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