Startup Idea: Salesman Location Tracking and Status Update App

Startup idea to develop an economical app designed for advertising sales businesses. The app would allow salespeople to check-in at a location, note its status as 'signed', 'working', or 'declined', and view this information on maps and lists. It should implement distinguishable colors to represent different staff members to avoid repeated visits to the same businesses.

My business involves advertising sales - we could use an app that allows our salesman with the press of a button to "check-in" to a location and note it as "signed, working, declined" - with outputs displayable as maps and lists including dates/times - and each salesperson displayed in an assignable color - so that other salesmen are not going to those same businesses which have already been visited, and we can see which have not been visited. we have searched but the only apps we can find are a minimum $30 per month subscription service - and many require additional money for each addition person/device. we are a small business that is out of our budget as a monthly fee.