The Naval SITREP is published twice a year by the Admiralty Trilogy Group. It supports the Admiralty Trilogy game system with scenarios, articles on history and technology, and rules expansions & corrections. The Naval SITREP Issue #57 was published in October of 2019. Table of contents: Features: Nanchang is a Museum Ship Harpoon V Scenario: Systems Test Annex A - Ship, Annex B - Aircraft A Primer on Formation Air Defense A Harpoon Convention Game using SimPlot CaS Scenario: Mediterranean Encounter German Escorts and their Nebelwerfer Armament Senkaku (ed: Scenario) Revisited - Stealth Isn’t Everything Organization of German Navy Light Forces in 1918 CaS Scenario: Force Z – Ozawa’s Interception Russian Feedback Getting Aunus Right Rule Changes and Corrections Harpoon Sonar Q&A Product Updates Book Reviews In Deepest Secrecy: Dutch Cold War Submarine Operations, by Jaime Karremann The United States Naval War College 1936 Wargame Rules, John Curry and Chris Carlson, ed. British Naval Weapons of World War II, the John lambert Collection, Vols. 1&2, Norman Friedman, ed. A Carrier at Risk, by Mario Sciaroni Italian Naval Camouflage of World War II, by Marco Ghiglino