Google map for sales Rep

We have 4 sales rep for the moment. We d'like to have 1 google map per rep. The map must be able to : 1) geolocalise the sales rep (on his iphone, ipad) 2) mark all the customer of this sales rep in a range of X km with a colored icon (3 différent color depending of the type of customer) on the map 3) The map must look at a centralised place (sql ?) to take the différent data so we can easily append this file) 4) The map must be usable in deplacemment (iphone, ipad) and also from the office in order to allow planification of visit.(explorer or chrome) We also need a "manager" map wich include all the data of all the sales rep Based on google map Api V3 Best regards