the third argument is space remaining in buffer, not size of buffer...
../../libraries/AP_AIS/AP_AIS.cpp:183:71: warning: Potential buffer overflow. Replace with 'sizeof(multi) - strlen(multi) - 1' or use a safer 'strlcat' API [unix.cstring.BadSizeArg]
strncat(multi,_AIVDM_buffer[msg_parts[i]].payload,sizeof(multi));
^~~~~~~~~~~~~
../../libraries/AP_AIS/AP_AIS.cpp:185:49: warning: Potential buffer overflow. Replace with 'sizeof(multi) - strlen(multi) - 1' or use a safer 'strlcat' API [unix.cstring.BadSizeArg]
strncat(multi,_incoming.payload,sizeof(multi));
clang reports this could be a problem when compiling under some EABIs. Remove it from most places as it is just noise, replace with class where we want to avoid including Location.h
