NorthStar 961 Install Manual page 61

Changing the
output rate
Changing the
NMEA 0183
waypoint ID
Setting the NMEA
0183 checksums
961/962 INSTALLATION MANUAL Revision A
3. Press the
unchanged).
Setting the output precision to three or four decimal places
doesn't mean the 961/962 will navigate with that accuracy.
Position information can be output and displayed to four
decimal places, but the user's actual ability to navigate with
such accuracy is limited by the accuracy of the GPS system.
Therefore, specifying more decimal places in the data output
doesn't necessarily result in greater navigating accuracy, but it
may improve the smoothness of plotted data. For more
information, see Chapter 2 of the Northstar 961/962
Operations and Reference Manual (part number GM1900).
The 961/962 normally uses a two-second update interval for data
transmission. Some applications require a longer update period, so the
961/962 lets you increase that span to 199 seconds. You can choose a
one-second interval, but at that rate, the bandwidth of 4800-baud NMEA
data only allows the output of a reduced set of sentences.
To change the output rate:
1. From the PORT SETUP screen, press the
the SEND EVERY field.
2. Enter a number, then press the
leave the option unchanged).
Many marine electronic devices (such as radars and electronic plotters)
can display waypoint names, rather than just a number, if they're output
by the 961/962.
If the peripheral equipment has this capability, at the PORT SETUP screen,
change the 961/962's 0183 WAYPTS field from NUMBERS to NAMES by
highlighting the field, making the change, and pressing the
The listening device will now display the nine-character waypoint names
(included spaces). When exporting to another device, be aware that the
numerical identifiers aren't assigned sequentially and therefore may be
re-used by the system on a random basis.
Be sure to verify this capability in the listening device before
changing the
won't understand this identifier, so using it may cause
problems with the display of the waypoint information.
Certain older devices may not accept sentences containing the NMEA
0183 checksum output by the 961/962. In such cases, the device may not
operate properly, if at all. If you have difficulty when interfacing to older
key (or press
NOTE:
NOTE:
0183 WAYPTS
field. Most older equipment
SECTION THREE - Interfacing
to leave the option
to highlight
key (or press
Page 51
to
key.