NorthStar 951X Installation Manual - page 58

SECTION THREE - Interfacing

Page 48

951/952 INSTALLATION MANUAL Revision B

Setting the NMEA

0183 checksum

Certain older devices may not accept sentences containing the NMEA 

0183 checksum that’s output by the 951 or 952. In such cases, the device 

may not operate properly, if at all. If you encounter difficulty when inter-

facing to older equipment, the unit offers the flexibility of turning off the 

NMEA 0183 checksum. 

1. At the PORT 1 SETUP or PORT 2 SETUP screen, press the 

 to highlight the NMEA 0183 CHECKSUMS option, then press 

the 

 menu key. 

2. Press the 

   to change the setting from  to and 

press the 

key when done.

Selecting an

independent NMEA

output-port datum

You can adjust output position for NMEA 0183 ports 1 and 2 to specific 

geodetic datums, independently of the datum you choose for positional 

display. 

1. At the PORT SETUP 1 or PORT SETUP 2 screen, highlight the OUT-

PUT DATUM option, then press the   menu key. 

2. Scroll through the choices using the 

down to make 

your selection. To apply this chosen datum to your lat/lon coordi-

nates in the NMEA 0183 output sentences, press the

key.

Connecting to other equipment

Connecting to other

Northstar units

Two 951, 952, or 941 units can be connected in order to take advantage 

of the waypoints/routes sharing feature. This convenient feature lets all 

waypoints and routes be transferred between any combination of two of 

these units. 

Using this feature involves three main steps, which you should perform 

in the following order: 

1. Check that each unit you want to share waypoints and routes with is 

operating with software version 3.12 or higher. To determine the 

units’ current software version, press the 

 key until you display 

the USER CUSTOMIZATION screen is, then press the 

 key to display the SERVICE INFORMATION screen. 

The MAIN BOARD SOF VER field displays the current software ver-

sion. If this version is earlier than 3.12, you must upgrade this unit to 

version 3.12 before it can share waypoints and routes with another 

NOTE:

There is no standard for identifying how numbers should be

assigned when converting waypoints from names to numbers.

When you export waypoint information as numbers to a

peripheral device, be aware that numbers aren’t sequentially

defined and may be re-used on a random basis.