Curious is anyone has hooked up a J&M CFBR-GL1800 (cellphone/GPS integration unit) and a Garmin Zumo 660 on their bike. I have installed two of these units on friends bikes, and when using the cellphone, the person being called hears a very loud buzzing sound. We tried everything imaginable to fix it to no avail. While in Daytona, we talked with a tech and he said to not power the GPS and J&M unit from the same power source. So we correct that and it still doesnt fix it. So today we call J&M and the gentleman we talk to tells us the unit isnt really designed for using a bluetooth cellphone and GPS at the same time with the J&M unit . WHAT! Their instructions tell you how to set up the system for that. Whats the world coming too?