NorthStar 951, Operator'S Manual

Page: 177 / 206

Chapter 11 - Customizing the Unit
951/952 Operator’s Manual Rev. B Page 167
3. Press the once to change from
AUTO
to
MANUAL.
A differential transmitter frequency appears to
the right of the word
MANUAL.
4. Press to highlight the digits you want to
change. Enter the appropriate frequency—to any value
between 283.5kHz and 325kHz—and press the
key when you’re done.
NOTE:
You can also manually set the baud rate (the transmitter’s data transmis-
sion speed) for the selected differential frequency; h
o wever, it is strongly
recommended that you leave the
BEACON BAUD RATE
setting at
AUTO
.
NOTE:
A non-Northstar external differential receiver can’t be manually controlled
by the 951/952, unless it supports the MX50R control protocol. Refer to
the particular differential receiver manufacturer’s instructions to determine
if this control protocol is supported.
Enabling/disabling
DGPS
You can enable or disable the use of differential information.
To set this option, at the
RECEIVER OPTIONS
screen, press the
menu key. Press the to select enabled or
disabled. Press the key to make the change, or
to leave the option unchanged.
Changing DGPS
data time-out
The
DGPS DATA TIMEOUT
setting determines how long the
unit will continue to use old DGPS corrections if no new cor-
rections are being received (due to bad weather, extreme dis-
tance from beacon, and so on). If this time period elapses with
no new corrections received, the unit reverts to standard GPS
navigation, and displays
OLD CORRECTIONS
as the DGPS sta-
tus on the
DGPS STATUS
screen.