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Chapter 5 - Understanding Position Coordinates
961 Operations and Reference Manual Rev. D
Page 5-5
transmitter now in use. The lower half of the screen shows the
beacon’s name, and the transmitter’s frequency and baud rate.
There are three bar graphs that display:
•
SNR
•
SIGNAL
•
NOISE
SNR
is a good measure of overall signal quality, and should be
as high as possible. Values of 15 and higher are preferable;
anything below 10 could indicate poor reception.
SIGNAL
is the actual strength of the received signal, and
should be as high as possible. Signal strength varies with the
distance from the differential transmitter.
NOISE
is the level of static caused by lightning and other
atmospheric effects, and should be low for best results. The
range of noise-level meanings are outlined in ”Table
2: Noise-level meanings” below.
For information on optimizing these numbers, see the
North-
star 961 GPS Chart Navigator Installation Manual
.
Table 2: Noise-level meanings
Noise level value
Meaning
200 and less
excellent
1,000–3,000
typical at night
5,000–10,000
thunderstorm
Содержание 961X
Страница 1: ...961 961 GPS Chart Navigator Operations and Reference Manual P N GM1700 Revision D X XD ...
Страница 8: ...Page viii 961 Operations and Reference Manual Rev D ...
Страница 10: ...Page x 961 Operations and Reference Manual Rev D ...
Страница 58: ...Chapter 2 Introducing the 961 Page 2 16 961 Operations and Reference Manual Rev D ...
Страница 140: ...Chapter 5 Understanding Position Coordinates Page 5 12 961 Operations and Reference Manual Rev D ...
Страница 172: ...Chapter 7 Creating Avoidance Points Page 7 16 961 Operations and Reference Manual Rev D ...
Страница 198: ...Chapter 8 Creating Routes Page 8 26 961 Operations and Reference Manual Rev D ...
Страница 262: ...Chapter 12 Alarms TideTrack and Currents Page 12 16 961 Operations and Reference Manual Rev D ...
Страница 348: ...Chapter 14 Service and Maintenance Functions Page 14 20 961 Operations and Reference Manual Rev D ...
Страница 374: ...Index Page I 12 961 Operations and Reference Manual Rev D ...