CLS View is a free Android application developed by Collecte Localisation Satellites. It allows users to view their Argos Web, MyData, Fish Web, or Themis Web tracking data on their Android devices. The app provides a user-friendly atmosphere for both maritime and terrestrial applications, displaying maritime mobile positions on detailed marine charts or terrestrial mobile positions on openStreetMap and/or satellite maps. Additionally, CLS View can display any WMS or TMS map layer.

The app's tracking functions include displaying locations (date, latitude/longitude, speed, and heading), measuring the distance between two points, and calculating the estimated time of arrival. However, it must be noted that the tracking/position display function is available for CLS clients only, as CLS View automatically connects to the CLS server to download 20 days of tracking data.

Overall, CLS View is an excellent app for those in need of tracking and monitoring mobile positions for maritime and terrestrial applications. It provides a user-friendly interface and various tracking functions, making it a must-have for those who require such services.