RoyalTek RBT-1000 - Manual (Page 21)

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4.2. Navigation Page
You can set GPS-relative parameters by this dialog.
4.2.1. NMEA Mode / SiRF Mode
Display (or change) the mode of device.
Setup the parameters of in NMEA Mode or SiRF Mode.
4.2.2. Degraded Mode
Enable or disable degraded mode.
4.2.3. Elevation mask
Elevation mask setting.
4.2.4. DOP Mask
DOP mask type and DOP mask value setting.
4.2.5. SBAS Mode
Enable or disable SBAS function.
4.2.6. Default
Reset values of this dialog into default value. It has not changed the setting
of device yet. You still need to push OK button if you want to change the
setting of device.
4.2.7. OK
Upload the parameters to the BT GPS mini.