change eth0 to static

[abarrow]

255.255.255.0 is what is called a "netmask". It defines the size of your local network (in this case, 254 total addresses), but not an actual IP address or subnet. Typically, a network interface is defined by a few parameters, the main ones being IP address, netmask and often things like gateway address an a few others. When you set an interface to get it's address from a DHCP server, you are telling it to broadcast a request to your local network (typically) to ask if any device on the network is the DHCP server, which is responsible for issuing addresses from a predefined range. What should happen is that one of the devices on your network will say "Me! Me!" and send the requesting device an address, a netmask, a gateway address and usually the addresses of DNS servers. In the case of the Openplotter access point, the netmask is 255.255.255.0 and the address range, by default, is 10.10.10.1-254. The DHCP server will be given a somewhat smaller range of addresses to choose from that overall range.

Sooooo, not sure what the address is that you are talking about for your Garmin Radar. I doesn't look like a multicast address. As far as putting your Garmin Radar data over WiFi, Stripydog has some interesting observations on that here: http://stripydog.blogspot.mx/2015/01/rad...retty.html

As far as your wlan1 is concerned, try adding this to your interfaces file, before the iptables lines:

allow-hotplug wlan1
iface usb0 inet dhcp

Openplotter might overwrite this next time you reconfigure your network devices, but it's work a quick try to see if it starts working.