Help with "dynamic map"

I have a problem I hope someone can help me with… I’m involved in planning a bicycle race… What I need to make, is a “map” that shows how far each of the 4 teams are in the track… It need to make it dynamic, so I can type in the percentage of the track each team has finished, and then have the different markers on the map placed according to the numbers…

Look at my illustration to get a clearer picture of what I need:)

I really hope someone can help me in the right direction here:)