A free program for Android, by TAK Product Center.

ATAK-CIV Android Team Awareness Kit – Civil Use is an Android app that allows you to connect to the ATAK-CIV server and receive information in real-time. This tool is used for civil purposes only and is intended for law enforcement, fire rescue, and other organizations that need to monitor and track the location of Android devices. The ATAK-CIV app includes several useful features, such as online and offline mapping, support for high-resolution imagery, collaborative mapping, and numerous icon and overlay settings. You may also utilize navigation tools when walking, driving, or flying, as well as mark your location, and share files, images, and videos. The app also includes elevation tools, heat maps, and contour maps. And so much more.