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This page is used for entering the connection information for the primary GPS device used by Cumulus for navigation. Please refer to your GPS manual for these connection values. Cumulus can also accept and process data from other peripherals such as Cambridge, Volkslogger, Flarm or LX Navigation.
Under Android this page is nearly empty. Please use the Android menu key to switch on/off your desired GPS device.
Cumulus can provide you with some status information concerning your GPS reception. If you want to know what satellites are in view, where they are, how strong their signal is, or if you want to take a look at the raw NMEA stream of your GPS, use the G key or click on the GPS status indicator in the status bar. This will open a status dialog for the GPS. The dialog can be closed with the "close" button.
Item | Description |
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GPS Location | only for using the Location Service provided by the Internet Tablets N8x0/N900. Users of the N8x0 or N900 can make use of the option in the tablet's own Settings/Control panel/GPS location to use either the built-in GPS receiver or an external Bluetooth GPS device. |
BT Adapter | for direct connection to an external Bluetooth device. In this case Cumulus will automatically scan your environment for a reachable device, and, if it finds one, will open up a combo box dialog from which you can make the appropriate selection. A wrong selection will mean that you will have to restart Cumulus! |
/dev/ttyUSB0 | for a USB GPS device or, e.g., a USB-serial adaptor |
/tmp/nmeasim | for the Cumulus NMEA Simulator |
Serial devices and RS232-USB adapters also need to be given a speed rate for their operation. The default serial NMEA connection speed is 4800 bps but we recommend always to use the maximum supported speed.
If your device is not found in the selection list, you can change one of the predefined entries to what you need, e.g. /dev/ttyS0 for an RS232 serial device or /dev/rfcomm0 for a Bluetooth device.
Item | Description |
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GPS | The default selection is GPS. Most GPS devices send MSL (mean sea level) altitudes, but some send HAE (Height above ellipsoid). |
Pressure | Some logger devices can deliver altitude values derived from
a pressure sensor. If you want to use these pressure data, select
this alternative. Please note! If you have selected the pressure item, Cumulus expects to receive the appropriate NMEA records from the connected peripheral device. Without these you will not get any altitude data displayed at all, nor will you get a variometer reading, unless this information is supplied separately by the peripheral! |
If your displayed altitude always deviates by a constant factor from the expected value, you can correct this in the altitude dialog. This is opened by tapping on the altitude display in the map view. Add your correction value in the spin box labelled "Leveling". Positive values will be added to and negative values subtracted from the delivered altitude value. For pressure values, the correction will be applied immediately. For GPS values, the correction will only be applied when a GPS fix is established.
Cumulus processes additional data from the devices listed below, if they are connected, but only if the data sentences have a valid checksum. Data from external devices are the first choice for Cumulus before its own calculation is started. This means that the wind, variometer and MacCready data from these peripheral devices will be accepted and used automatically, if they are available. The MSL and STD altitudes derived from a pressure sensor, however, are only made use of if specifically asked for, i.e., "Pressure" must be selected in the menu.
Device | Processed data |
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Cambridge | This can deliver altitude values (MSL and STD) derived from a pressure sensor. Cumulus also uses the QNH, wind and McCready data from the Cambridge !w proprietary sentence (see below). |
Volkslogger | This can deliver the STD altitude derived from a pressure sensor. To get the right MSL altitude, you have to set the correct QNH value in the Cumulus Preflight Settings/Common or in the altitude dialog. Furthermore, in the Volkslogger setup menu, you have to enable the sending of PGCS records. |
LX Navigation | This can deliver altitude values derived from a pressure sensor and wind data. Some devices can also deliver McCready and variometer data. Enable the sending of LXWP records in the LX setup menu, as follows (e.g. on an LX20 device you will have to enter the password - the default is 96990): go to the NMEA menu, where you should set the entry LXWP? to 'Y'. Set the transfer speed in Cumulus to 4800 bps - the LX20 device uses this speed for NMEA transfer regardless of the selected PC transfer speed. |
FLARM | Hardware version 2 or later. This can deliver altitude values derived from a pressure sensor, as well as aircraft and ground obstacles information. Enable the sending of these data in the FLARM setup menu. Look also at the page Cumulus Flarm for more information. |
NMEA Id | Description |
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$GPRMC | Recommended Minimum Specific GNSS Data |
$GPGLL | Geographic Position - Latitude and Longitude |
$GPGGA | Global Positioning System Fixed Data |
$GPGSA | GNSS DOP and Active Satellites |
$GPGSV | GNSS Satellites in View |
$GPDTM | Map datum |
$PGRMZ | Garmin and FLARM proprietary sentence with barometric or GPS altitude data |
$PFLAU | FLARM proprietary sentence with status, intruder and obstacle data |
$PFLAA | FLARM proprietary sentence with data about other aircraft around |
$PCAID | Cambridge proprietary sentence with STD altitude |
!w | Cambridge proprietary sentence with MSL altitude, QNH setting, wind direction, MacCready value, wind speed and variometer data |
$PGCS | Volkslogger proprietary sentence with STD altitude |
$LXWP0 | LX Navigation proprietary sentence with MSL altitude, variometer and wind data |
$LXWP2 | LX Navigation proprietary sentence with McCready data |
$MAEMO0 | Cumulus internal proprietary sentence, if LibLocation from MAEMO 5 is used |
$MAEMO1 | Cumulus internal proprietary sentence, if LibLocation from MAEMO 5 is used |
$Android | Cumulus internal proprietary sentence, if the Android device delivers only own location updates and no NMEA data. |
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