Position and GPS
The GPS position node tells other nodes where the station is and, if the source knows it, which way it points. One node can feed many.
Pick a source
| Tab | Source |
|---|---|
| Receiver | A serial or USB NMEA GPS on the server. Set Port, Baud and Rate. |
| Network | gpsd, default 127.0.0.1:2947 |
| Fixed | Latitude and longitude you type in |
| Phone | A paired phone: position and heading |
Serial and gpsd sources must be reachable from the server, and reconnect on their own. Forget source picks a different one.
The node shows the fix, your Maidenhead locator, accuracy, speed, and heading and tilt when the source has them. A lost fix is reported, and old coordinates stop being used. A phone that drops out reads Offline.
Heading
Heading is true north.
| Source | Heading from |
|---|---|
| Phone | Compass, gyro and GPS course, fused on the phone |
| NMEA | HDT and THS sentences. Magnetic headings are ignored. |
| gpsd | ATT reports |
An NMEA or gpsd heading older than two seconds is dropped. An Array set to Heading turns with it.
What uses it
| Node | Uses position for |
|---|---|
| ADS-B channel | Decoding aircraft positions |
| Array | Where the array stands and which way it points |
| Map | Your station and its GPS trail |
Passive radar tx | Where the transmitter stands, from a Fixed source |
| Propagation map | Your end of every path |
| Recorder | Location in the recording's metadata |
| Satellite | Pass and Doppler prediction |
| Signal hunt | Where you stand and which way you point, for sweeps |
| Signal survey | Where each measurement was taken |
| Triangulation | The vehicle to guide |