134 Chapter 9 Learn Geode Connect for Windows PC
Geode GNS3 Real-Time Sub-Meter GPS Receiver
SBAS
This specifies which SBAS
satellites the Geode should
use for GPS correction.
Usually, selecting Auto is
sufficient, since the various
SBAS services cover very
different geographical
areas. However, there are
some areas where these
services overlap (see map
below).
For example, if you are collecting corrected GPS positions
in the Northeastern United States, the Geode may be
receiving SBAS corrections from WAAS or EGNOS. If the
receiver is set to Auto, it may even jump back and forth
between the two. The two services use different reference
datum or models. Switching between them can cause
significant error between different points of data.
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