Dear sir/madam,
We would like to help you build this app. For this app, we would ask users for permission to take their locations. By doing that, we could get data and upload to server. The location results could be displayed on google map interface. If you dont have web service, we could use our web service to build. The total time it takes to build the app would be nearly 3 days only (in case you want to change UI).
Please inbox us if you're interested in your proposal.
Thank you very much,
Nick