GPS location service using Google API. With extra pop-up information.

Hello We drive around in a car and delivery newspapers and adds. Its the same route each day, but which addresses that needs delivery changes from day to day. Also the same address can have multiple delivery-places (either in mailbox, in a tube or in a plastic-bag). There is a total of up to 400 addresses and then 1200 possible delivery points. We would like a webservice using Google API where driving-directions come from Google maps/api. When the driver closes near a drop-off point, then information on where to deliver will pop-up (text from the .xlsx) and possibly also an image can be included - there is an example for this in the attached .xlsx file. Each day we have a list of what to deliver. That information from a simple file will be updated each dad to the webservice. So this will assist the driver in where to drive, and exactly where to deliver - and what to deliver. Attached there is an example file with all delivery-information for a small part of the route. Here are all the possible addresses all marked with multiple drop-off points. The GPS coordinates are always fixed for an address (Each address can have up to three coordinates. Your job is to come up with a simple and cheap solution so that the current GPS-location is shown on the map while driving. I´m open for suggestions. Attached example file with locations and requirements.