Ok all this is what and how I worked this out for myself. You may want to use your own tactics.
As far as the Navi 4 goes on the 2011 with Sirius there is an issue. And I don't have a 2011 without Sirius to confirm but this is what I think. The new BMW/Sirius antennae is located just forward of the instrument cluster and is mounted on a metal tray. This effectively blocks the routing of the Navi 4 cradle cabling as indicated in the accompanying instruction manual. So after trying for quite a while and thinking I am an idiot I rerouted thusly: I took the trim off from around the instrument cluster and routed around the cluster and then down. Works fine and cable length is perfect with no redundant tieoffs necessary under the triple clamp..
You might choose to disassemble the tupperware and find a routing but I like what I have done for ease of install.
Ok on to the cable for the stereo. My purpose was to set up an aux female trs connector so I can plug in my etymotics which are built into earplugs which give my a nice quiet ride and good audio and I just like it, G.
The 2 cable heads left by BMW for audio are next to one another and the power for the GPS is just adjacent all with an inch or two of one another. So I plugged in from the Navi 4 cradle power and audio and it does integrate nicely in the audio stream. Now I have to wire the 4 wire cable referenced earlier in this thread. I noticed the 4 yellow wires are numbered 1-4. And I went to radio shack and got a female trs or aux jack 3.5mm connector. I then taped and labeled the 4 yellow wires 1-4 so I could see the numbers easier and sat down by the front of the bike and with the disassembled trs jack in my hand and manually held all 4 wires in different combos up to the various points in the trs until I found l-r-gnd.
Caveat, the stereo was on with speakers selected and line out on which activates the cable we're working with. In my case I found 1 to be L, 3 to be right, and 4 to be ground. Not that it matters that much since the bike does not have a left to right audio switch onboard anyway. Also, if you look into the trs connector you can see that the tip of the male would be L, and the midpoint would be right, and the major portion of the shaft would be ground. So you would apply that to the female trs (just google male female trs) and figure out how to solder. And make sure your battery is fresh and charged or it will be turning off the stereo for you automatically and making you dip into your reservoir of swear words.
After I had determined the way to connect the wires I pulled the plug out and soldered the wires into the female trs with a radio shack soldering gun and assembled it with some heat shrink and protective sheathing and installed and zip tied off underneath as shown:
Anyway, it's all done and won and I'm happy so I hope this is useful to someone and safe riding all.