App for your boat stereo

After going to the boat show I was impressed by how many of the new boats are using bluetooth for their stereo's. So I got to thinking that it would be awesome if you could also talk into your phone to communicate with the rider via the tower speakers, music player with a PA button. Some other cool features might be speed variable sound. I did some searching and nothing like this seems to be out there. I'm not a programmer, but I'm sure some of you are, so here is my million dollar idea. (Maybe if if pays off for you can can hook me up in the future.)

Are there any other apps out there that already do this? What other features would you like for your phone/ boat app?

there are already speed sensing apps that adjust volume.

I don't think there's a music playing app that has speak over feature.

Audio Cruise Control (iPhone) is what I use for speed/volume control. I've tried basic mic apps but they just produce nothing but produce feedback and pierce my ear drums so I gave up on them. If you find anything that works please share.

I've tried an iPhone mic app, but I get feedback, since it plays on the tower speakers and the in-boat speakers. Some type of noise cancellation is needed there, more of an acoustic limitation than a programming limitation, the way I see it.

A buddy of mine wrote an android app that controls volume by speed. Below a certain speed, and the volume adjusts itself way down. Above speed, it turns it back up. The threshold is probably anything over idle speed. He's used it on his phone/boat with minimal issues.