So my idea is the following:

This FM Modulator is sending the voice information form my navigation system to my Empeg over +- 90 MHz. The easiest way now is, that I save this frequency on my Empeg tuner. If I then need the voice form my navi system, I switch manually form MP3 or radio music to this presetted frequency.

But much nicer would be, when the empeg detects a signal on that frequency, that it goes automaticly to that modulator frequency. I am thinking something like Traffic Announcement.
Then with after a period (30 sec), if there are not comming new information to the Empeg, it's switching back to the last source...

What you think? Can Mark Lord do something like that?

bye