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Field Spotter is a **web-based spotting tool** specifically engineered for portable amateur radio operations such as POTA, SOTA, and WWFF. It presents real-time activity on an interactive map, allowing users to visualize activator details, park/summit codes, distance, and spot age, with older spots gradually fading for clarity. The interface includes robust filtering capabilities by program, mode, and band, alongside extensive display configurations for map styles, the **terminator (greyline)**, Maidenhead grid, CQ zones, ITU zones, and WAB/WAI grids. Users can customize spot display duration, show QRT and pre-QSY spots, and select from various map providers like OpenStreetMap and ESRI. Authored by Ian Renton M0TRT, Field Spotter also incorporates features for re-spotting and provides convenient popup links to external callsign lookup services, program websites, and WebSDRs, including a 750Hz offset option for CW reception. The platform operates with a strong emphasis on user privacy, collecting no personal data and storing any location or callsign information exclusively on the user's local device, ensuring a secure and private spotting experience for portable ops.