An English rewrite of Jean-Luc Aufranc’s May 25, 2026 CNX Software piece on V2X2MAP — an MIT-licensed Android app by Peter Holzhauser (Pit711) that pairs with a cheap Waveshare ESP32-C5 dual-band Wi-Fi board to receive the European ITS-G5 / 802.11p V2X stack and plot CAM, DENM, SPATEM and MAPEM messages on a live map. Includes the legal disclaimer carried inside the app and a defenders’ view of the privacy and detection implications.