Summary

Indicate most recent position data for riders on the map with markers.

Details

Any rider has a most recently known position. Showing this on the map would be useful. It would be good to indicate (through color?) the age of the information as there will not be live up to date GPS information for the riders.

Constraints

• Good to support 1 to many riders and 1 to many allowable updaters.
  
• Good to support multiple input styles (lat/lon, street addresses, zip codes).