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Rev. D 3 — Basic Navigation
3 — Basic Navigation3 — Basic Navigation
3 — Basic Navigation Page 29
The lower part of the screen shows three bar graphs:
1.
SNR
SNRSNR
SNR The Signal to Noise Ratio (SNR) is a good overall measure of
overall signal quality, and should be as high as possible. Values of
15 and higher are preferred, while anything below 10 could indicate
poor reception.
2.
SIGNAL
SIGNALSIGNAL
SIGNAL The actual strength of the received signal—should be as
high as possible. Varies with distance from beacon transmitter.
3.
NOISE
NOISENOISE
NOISE Noise level measures the “static” caused by lightning and
other atmospheric effects, and should be low for best results. See
“DGPS antenna mounting” on page 112, for further details.
NOISE LEVEL VALUE MEANING
200 or less excellent
1,000 – 3,000 typical at night
5,000 – 10,000 thunderstorm
At the bottom of the screen a summary of DGPS operation is displayed.
You may see one of the following messages: