Mr. Devil using the GPS Navigation system how does it work. Will it give me turn by turn with sound through the speakers or headset. Or do I add a screen? I'm not used to have these type of options. 
Chris 
The GPS Navigation system on the SEUC is definitely not a full feature system. (Some would accuse me of being overly kind in my assessment of the features.

) I find it to be an adequate, Point A to B (with no ability to do waypoints) system. It will give you voice prompts, (through the bike's speakers and/or helmet speakers) and does show a graphic representation of what directions (by way of arrows) you'll be taking and how close you are to your next maneuver. There are no map displays, which I find amazing considering the price that HD charges to add that capability to the HK head unit. And lack of color display is even more amazing. I primarily use it to get "home" when I'm traveling. I'll map out my route for the day and at the end of the day if I need to get back to where I started, I just hit home on the unit, which I set up before I left. I also use the unit for the HD directory that's built in. But be careful, with a lot of dealerships moving to new locations, it may not be accurate. I've found some dealerships that are listed in the database to be two to three miles away from the point the GPS took me, only to find out that they moved to a new location within the last year or two. I only use the built in unit, because it came with the bike. I never would have purchased it separately. My advice is play with it and if it works for you, great, if not get a Zumo 550 or 660, which are by far, better GPS units. I don't know why the MoCo just doesn't build one of the 660s into the SEUC, that would be really cool if they did. Hope this helps.