Specifications

Operation | 7
2 Operation
General
The MX521A DGPS sensor is an integrated GPS and
beacon receiver unit that is fully automatic and usually
does not require user intervention in most cases. It will
automatically search for available satellites as soon as
power is applied.
Not available with MX521A GPS only models.
The internal 2-channel beacon receiver inititates an
Automatic Beacon Search (ABS) on power on for the first
time. The primary channel will lock-on to the nearest
beacon station, while the second channel searches for
other available beacon signals. Should it find a superior
signal, it will automatically switch the primary channel to
the new station.
The MX521A beacon receiver can be controlled by a
Control Display Unit (CDU) like an MX420 or MX500
series, to operate in Automatic Beacon Search mode,
Manual Tune or Database mode. The Database mode
allows the beacon receiver to pick 10 stations that are
closest to your present position. This feature complies
with the IEC 61108-4 specifications.
The combined performance of the high-precision 12-
channel GPS and 2-channel smart beacon receiver
provides a more accurate position fix, usually within 3
feet or less.
Satellite Based Augmentation System
(SBAS)
In areas where land-based Coast Guard beacon stations
are not available, the MX521 can be controlled (using the
MX420 CDU) to track the Satellite Based Augmentation
Systems (SBAS) like the WAAS (US), EGNOS (European)
and MSAS (Japan) satellites. These satellites transmit
DGPS correction data (just like the Coast Guard stations)
using the GPS frequency. Refer to the MX420 Operator