NorthStar 957 User Manual

Although the need is rare, you can manually override 
automatic mode at any time by issuing tuning commands 
using the 957’s KEYPAD. In manual mode, the differential 
receiver outputs its corrections only from the selected station. 

To manually choose a differential station, you must select the 
frequency of the desired station:

1. On the RECEIVER OPTIONS screen, highlight the BEACON

FREQUENCY option and press the EDIT menu key.

2. Change the settings from AUTO to MANUAL. A differen-

tial transmitter frequency appears to the right of the word

MANUAL.

3. Press the CURSOR PAD right to highlight the digits you

want to change. Enter the appropriate frequency—any
value between 283.5kHz and 325kHz—and press the
ENTER key.

You can also manually set the baud rate (the transmitter’s data transmis-
sion speed) for the selected differential frequency. However, Northstar
strongly recommends leaving the 

BEACON BAUD RATE

  setting at

AUTO

.

The 957 can manually control a non-Northstar external differential
receiver as long as the receiver supports the MX50R control protocol.
Check the manufacturer’s instructions to see they support this control pro-
tocol.

The 957’S differential operations setting has four options for 
differential information: 

auto - the 957 prefers WAAS differential corrections, but 
will automatically switch to radiobeacon differential cor-
rections if WAAS is not available or less accurate and if 
the 957 is connected to an optional external radiobeacon 
receiver

disabled - the 957 doesn’t use any differential corrections, 
only GPS