2665 Series Operation Manual
EZT-2665-8000/6
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Page
32
of
64
8.2
S
URVEY
On selecting
S
URVEY
the following menu is displayed:
Fig 4 Survey
8.2.1
GPS
An external GPS receiver will need to output $GPGGA and $GPRMC NMEA format
strings at a baud rate of 4800 once per second (preferred) or at least once per two
seconds (8 data bits, 1 stop bit, and no parity).
Selecting
GPS
allows selection of the internal
and optional external GPS receivers.
In the GPS dropdown menu there are four
selections that can be made, Auto, Internal,
External, and Off.
Fig 4.1 GPS
With
Auto
selected (default), if valid GPS data is detected, Easytrak Alpha will
automatically go into ‘GPS’ mode presenting positions in UTM coordinates. In
‘Auto’ mode, External GPS always has priority over the internal GPS receiver.
Once Easytrak Alpha is using the External receiver, it will not switch to internal even
if the external data become invalid, as this could result in an unacceptable position
jump. However, should the user wish to switch to internal, then the ‘internal’ option
in the menu should be selected.
With
I
NTERNAL
selected, the internal GPS receiver is used irrespective of the
presence of an external receiver.
With
E
XTERNAL
selected, the External GPS receiver is used irrespective of the
presence of the internal receiver.
With
O
FF
selected, no GPS receiver is used and positions are presented in a XY
format.
