Techniques tracking, monitoring, updating, and displaying location and related information based on telemetry information received from mobile devices carried in the field. Each tracked entity (e.g., person, robot) carries or is associated with a mobile device. When a mobile device enters within range of a checkpoint associated with a known position, the mobile device notifies a central server or other system (e.g., a peer device), which then makes the received information (or information derived therefrom) available to other devices and/or systems. In some cases, the checkpoint devices are wireless network access points, such as Wi-Fi routers, access points, media device, or the like.