Hi, there.
I have gone through your post carefully and I can see that you want to implement interative Mapbox api with custom markers.
You need a map based on Real time data from GPS.
I am so very good in Mapbox API and Leaflet map including Polygone, Layers, GoeJSON etc.
I use the latest technologies to make pixel-perfect, responsive websites with cross-browser compatibility.
I'm ready to put my experience to use for you.
I look forward to the opportunity to work with you.
Best regards, Maksim.