You are seeing a couple of impossible altitudes and a couple of impossible longitudes. Looks like they're coming from the same aircraft. Possibly a nonstandard squitter? They pass checksum, but they don't contain the data you think they do.
Made a single registry of output plugins which gets populated on init with classes to output on a socket, print to screen, database, etc. Next step is to implement a SQLite database class.
Right now there's a 1e6 gain block in there because old USRP spit out roughly 1e6x data as USRP2. Haven't investigated this for USRP vs USRP2 yet. Don't know why blocks care, actually.
Nick Foster