I am not an expert on signals and indicators as I already accepted long time ago that I will forever be a non-techie person but I can recognize a potential with anything when I see one. I am sure there can also many people looking for the same things that you got into and if you can publish an app like this then there can be many downloads...and yes you can even monetize the said app if you like. Anyway, good luck and I am looking forward to experience that app myself in Google Play since I am using Android.