Horizontal Dilution of Precision of GPS Fix
This statement indicates the relative estimate of GPS horizontal position x accuracy:
<1 = Ideal—This is the highest condence level.
1-2 = Excellent—The position measurements are accurate for most applications.
2-5 = Good—This is the minimum information appropriate for making business
decisions.
5-10 = Moderate—This information could be used for calculation, but a more open sky
view is recommended.
10-20 = Fair—This indicates a low condence level, producing a very rough estimate of
the present location.
>20 = Poor—This information can be inaccurate by as much as 300 meters with a
6-meter accurate device.
Signal Stability Countdown
This counter starts when a signal returns after it had been lost. It counts down from
300 seconds, and when the timer reaches 0 (the signal has persisted for 300 seconds) the
signal is considered stable.
GPS Status
This statement indicates the status of Time, Position, and Reception conditions:
• Time and Position OK
• Time and Pos OK, Pending Stability
• Time and Pos OK, No Pulse Signal
• Time and Position Invalid
• Data Invalid: Serial-Line Anomaly
• Data Invalid: Serial-Line Error
• Data Invalid: Serial-Line Silence
• Disabled By User
• Not Initialized
GPS Signal Available
A Yes display indicates the GPS signal is adequate to permit GPS time synchronization.
Satellite Signal Noise Ratio
This displays the satellites in view by ID number and the signal to noise ratio in dB for
each satellite. The number of satellites in the list can be higher than the number shown in
the Number of Satellites Tracked by GPS eld. 30 dB+ is a good signal, 20 dB to 30 dB
is an acceptable signal, 10 dB to 20 dB is a poor signal, and less than 10 dB is unreliable.
32 S&C Instruction Sheet 766-530
General Setup
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