![]() The last received of either message will be used.Ĭontrol Checksum. The present filter does not handle the case where, for example position messages, are received from different sentences.As an example, GPGLL and GPRMC both transmits the position information. If this fails the next stream in line, with lower priority, kicks in and is used, until a higher priority stream appears. As long as a higher priority stream is available it's used. The priority is set for each NMEA sentence individually. Priority: Higher number equals Higher priority. Protocol: For future use, as only NMEA 0183 works, for now. It's important to get this right and not just guess. īaud Rate: This is normally 4800 for GPS and 38400 for AIS, but check the documentation for the connected device. If the port you are looking for does not appear in the selection, write the correct port yourself in this field. Some autopilots, among them Simrad, require navigational bearings, contained in the APB sentence, to be transmitted as Magnetic bearings rather than as True bearings, OpenCPNs default.ĭataPort: Pick a port by pressing the \/ o the right side of the field. Use magnetic bearings in output sentence ECAPB. This is a “design feature” of all Garmin receivers. The reason for this is that Garmin units cannot accept route uploads via standard NMEA0183. Make sure that this box is ticked, if you have a Garmin GPS. It is now allowed to use a numeric, two digit OpenCPN route name (e.g. The reason is that Furuno uses their own version of NMEA for uploading routes. Messages originating from GPSD or the VDR (Voyage Data Recorder plugin) will also show up in the debug window.įor simple NMEA data stream debugging, add the following to your opencpn.ini file:Under add a line DebugNMEA=1500 This will provide up to 1500 debug messages pertaining to NMEA traffic to the opencpn.log.įormat uploads for FurunoGP3Xinputfiltering: If the special Furuno gps protocol is needed, tick this box. If your GPS port is configured, and there is no “red” boat, then the only reasons are: no gps fix or wrong sentence configuration from the GPS. Note that the source of each NMEA sentence is printed after the time stamp o each line. ![]() If there are NMEA sentences in the debug window, then OpenCPN has opened the port set in the Data Connections. In Linux, the debug window can only be closed by unticking the Show NMEA Debug Window box, unless the the main Options dialog is closed. Known issues: The pause button only works if the main Options dialog is closed. The ECAPB sentences etc, will not appear while the Connections dialog box is open as autopilot output is disabled during this time. To see all messages it's important to close the Options dialog completely, while leaving the NMEA Debug window open. At the end of each sentence there is a “*” followed by a calculated checksum. $GPGGA above, is the talker GP = the gps, sending a GGA = position message, for example. OpenCPN generally does not care about the Talker ID, the first two letters in the message type. Have a look at the page NMEA Sentences to see which messages are understood. The reason that AIVDM messages are both dropped and appear as “Output message”, is that there is more than one source for this message, and the filter just applies to one source. Connections Priority change messages, will also be printed to the NMEA Debug Window. Messages in red could occur as well, and indicates a transmit error. In the picture above we can see the color-coding at work. If you check this box you will get a window that shows the NMEA data sentences coming into or going out from OpenCPN. If a broadcast connection is read/write, all data written will be read back leading to the potential for data loops. This is a possible configuration in the current release but neither required nor generally desirable. In previous releases of OpenCPN all UDP data connections would read data as well as write. Note that in this scenario the UDP connection is output only. Every computer on-board can be used as a repeater to the main box! All input sources are merged together and available to transmit to an external computer. ![]() OpenCPN on the XP box receives and shows all info from the three first ports and even data from the VDR plugin, if it's running. Both boxes are configured to use the same broadcasting address '192.168.0.255' on the local network, using the default 10110 port. Note that the connections are automatically sorted in order of the priority setting The picture is from a Linux computer, but the receiving box is an Win XP.
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