My shielded wire and a few other odds and ends arrived. The ELT can receive coordinates from a GPS and then send those coordinates out, and that's what the extra wire is for. The connection method they use is really laughable though. They have you solder four wires to little itty bitty DIN pins. I'll be pretty shocked if they last. The pins are about 1/16" long, very thin and not far apart from each other, so holding a wire up against them during soldering is next to impossible. This is probably why the instructions say to fill the cavity up with RTV and then wrap it all with tape. Pretty ridiculous for a certified system. If it ever fails I'll just cut the DIN connector off completely and use individual connectors. The main thing I dislike about the DIN connector is the fact that the male and female pieces don't positively lock with each other.
I finished wrapping up the left side wiring. At least I did until I realize I forgot something. It's starting to get organized!