GRAMS (Global Reconstruction, Analysis & Measurement System) has a proven 25-year record of innovation and success in the ASW domain. Across diverse platforms and operational situations, GRAMS has consistently and reliably detected, classified, and tracked submarines, torpedoes, and unmanned underwater vehicles in a post-mission mode utilizing geospatial replay and environmental modeling. Recent enhancements have enabled those same essential capabilities as an onboard real-time mode. Today, GRAMS performs all the signal conditioning, analysis, and visualization necessary for an ASW operator to fully process, track, understand, and report on passive and active acoustic signals in both real-time and post-mission environments.