Hey,
I've used MapKit and Google Maps in a number of projects, so your app idea sounds very interesting!
* Map with two polylines
* 3D touch or long-press gesture on polyline will pop-up a view (with text)
* Moving touch to other polyline updates the view text (we'll have to test this!)
* Release touch removes the view
I develop apps for iPhone/iPod Touch/iPad running iOS 9, using Xcode and Swift.
You can see some examples of my work, and client reviews of my completed projects, on my Freelancer profile page.
If you'd like to reply to this message, we can discuss things further, before you make your decision on awarding the project.
Best Regards,
- Rob Dixon.