Manually Setting the GNSS Position
The exact geographic position (location and elevation) of the antenna your NetClock unit—and thus its onboard GNSS receiver—is a major factor for NetClock to calculate an accurate System Time from the GNSS reference.
Note: The elevation (altitude) should be set in accordance with the World Geodetic System 1984 (WGS 84), not Mean Sea Level (MSL).
Normally, the onboard GNSS receiver will track and adjust the antenna position during the so-called GNSS self survey, which is performed during initial commissioning of a NetClock unit, or when rebooting a unit after it had been powered down for some time ("cold start").
Depending on where your GNSS antenna is installed and thus, how good the reception is, the self survey may be adequate for most applications.
Setting a Manual Position, however, i.e. manually applying your current geographic position data (Latitude, Longitude, and Altitude) may be necessary if your GNSS receiver could not complete its survey due to poor reception.
In some cases, setting the position manually may also help to reduce the amount of time needed for the initial position "fix", i.e. for NetClock to synchronize with the satellites in view.
Note: When manually setting a position, NetClock must be in one of the stationary modes, Standard or Single Satellite (see Selecting a GNSS Receiver Mode).
Note that this position will also be used if Apply A-GPS Data is checked.
To manually set your position:
- Determine your geographic position. For more information, see Determining Your Position.
- Navigate to INTERFACES > REFERENCES: GNSS 0. In the GNSS 0 status window, click Edit in the lower left corner. The GNSS 0 window will open:
- Under Manual Position Set accurately enter latitude, longitude (both in decimal degrees), and altitude (in meters [WGS 84]) of your GNSS antenna, NetClock can use this data during the satellite tracking/adjustment process, which typically leads to a quicker "fix". It is recommended to enter the position as accurately as possible.