About auto-dimming mode
SECTION TWO - Installation
and doesn’t consider atmospheric conditions, Selective Availability, and signal interference, all of which affect accuracy. HDOP can range from an ideal value of slightly less than one, up to a poor value of 10 or more; any value less than two indicates excellent performance.
Lat/lon coordinates
On the CHART screen INFO BARS, the 961 displays lat/lon as degrees, minutes, and thousandths of minutes. To display this data, press the INFO key several times. After press the first INFO key, a second INFO key is dis- played, letting you display additional data on the second INFO BAR.
SOG and COG
You can display SOG and COG in the INFO BAR on the CHART screen, or on the
SOG and COG readings result from ongoing measurements derived from the satellite signals; SOG speed is updated every second. You can set the 961 to display its SOG and COG readings more smoothly by setting the GPS speed averaging value up to 10 seconds. Increasing this averaging time, however, may reduce overall reaction time. For more details about GPS speed averaging value, see Chapter 14 in the Northstar 961 Opera- tions and Reference Manual (GM1700).
Loran-C TDs
The 961 also calculates
If you don’t touch any key on the control head for one hour or more, its LCD screen automatically dims to about half its normal brightness (based on its current brightness), if required by the system. Pressing any key at any time automatically restores the display’s previous brightness level.
This function helps maintain the integrity of the display screen and reduce power consumption when the 961 is on for many hours at a time. It is still recommended, however that you keep the lighting level lower when you don’t actually need it.
Turning the unit off
The procedure for turning off a system with two control heads is slightly different than turning off a system with one head.
To turn off an entire system (both the head and the processor) with one control head:
961 INSTALLATION MANUAL Revision A | Page 31 |
