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Old 28-08-2016, 21:25   #1
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GRadar on R Pi

Have been using OpenCPN on R Pi as plotter and NMEA reader. Trying to implement GRadar for my Garmin radar. All seems to be fine. The radar dome rotates when the switch is applied but I get the following issue in the log file: Failed to add to multicast group 239.254.2.0. Any thoughts? Thanks.

Bill
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Old 29-08-2016, 12:57   #2
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Re: GRadar on R Pi

Quote:
Originally Posted by wefleenor View Post
Have been using OpenCPN on R Pi as plotter and NMEA reader. Trying to implement GRadar for my Garmin radar. All seems to be fine. The radar dome rotates when the switch is applied but I get the following issue in the log file: Failed to add to multicast group 239.254.2.0. Any thoughts? Thanks.

Bill
That is probably caused by not specifying a default gateway.
Try.
Code:
 sudo route add default gw 172.16.1.100 eth0
To make the change permanent across restarts edit /etc/network/interfaces to look like this:
Code:
# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
    address 172.16.1.1
    netmask 255.255.240.0
    network 172.16.1.0
    broadcast 172.16.1.255
    gateway 172.16.1.100

ifup eth0

allow-hotplug wlan0
iface wlan0 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

allow-hotplug wlan1
iface wlan1 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
Chuck
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Old 03-09-2016, 20:28   #3
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Re: GRadar on R Pi

Thanks, Chuck, I was able to overcome this deficiency. However, I still was not able to get the radar to send data back to the Pi. Tried the same thing on a laptop with Win 10 with the same results. Are some radar domes just too old to work? Thanks, again.

Bill
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Old 04-09-2016, 07:47   #4
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Re: GRadar on R Pi

Right click on the screen and choose radar control Garmin from the menu. Choose master mode and then click the Gradar icon in the icon bar when the small indicator turns to solid orange.
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Old 04-09-2016, 10:47   #5
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Re: GRadar on R Pi

Thanks, I have done that but the red dot always looks red, rather than orange, and after a short period of time (maybe a minute) the radar stops turning. The system works fine when hooked to its MFD.

Bill
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Old 04-09-2016, 12:39   #6
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Re: GRadar on R Pi

http://opencpn.org/ocpn/Plugin_external_radar_garmin
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Old 04-09-2016, 12:55   #7
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Re: GRadar on R Pi

https://web.archive.org/web/20160401...l_radar_garmin
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Old 04-09-2016, 13:51   #8
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Re: GRadar on R Pi

Thanks, I have been through this manual many times. All seems to be correct other than getting a return from the radar unit. Have just retired and currently selling the house and downsizing so I can spend more time on the boat. Unfortunately that will likely keep me away from the boat for a while. I'll be back when I can spend more time trouble-shooting. Thanks again.

Bill
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Old 04-09-2016, 15:01   #9
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Re: GRadar on R Pi

Bill,
Selling my house also, so I understand being busy. I sent you a private message I hope you check for it.
Ed
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