Magellan MobileMapper - GPS Software Spécifications télécharger pdf (Page 23)

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- Minimum SNR: SNR stands for Signal-to-Noise Ratio.

Ensure your SNR mask is not set too low (less than

20). GPS signals with lower SNRs will be very noisy

and contribute to accuracy degradation.

- Elevation Mask: Angle that specifies that any satellite

must be at least a specified number of degrees above

the horizon (typically 5 to 10°) before the signals from

the satellite are to be used. Ensure that the elevation

mask set in your receiver is high enough to avoid using

satellites near the horizon as they are often noisier

than satellites higher overhead.

Tap Apply after making your choice and then tap OK to close

the GPS Settings utility. By default, the GPS is configured to

track satellites in normal conditions of reception (Open Sky).

NOTE: The first three options (Open Sky, Tree Canopy and Urban

Canyon) use preset values for Maximum DOP, Minimum SNR and

Elevation Mask.

Viewing Current GPS Status

The GPS Status utility allows you to quickly see if the GPS re-

ceiver is calculating a position from the currently visible GPS

constellation. It can also be used to log and playback NMEA

data. Do the following to launch GPS Status:

- Tap , then select Programs>GPS Utilities>GPS Status.

This opens the GPS Status window.

Regardless of the displayed tab, the bar at the bottom of the

screen displays the following, from left to right:

- The type of position being calculated (Fix Not Available,

Autonomous GPS or Differential GPS).

- The data logging status (No Log or Log:x.. xK where x.. x is

the current size of the file being logged, in kbytes).

- Position indicator light (Blue: Differential GPS position

computed; Green: Autonomous GPS position computed;

Red: No position computed).

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Magellan MobileMapper - GPS Software Spécifications Page 23