This page contains a full interactive map for Mortal Shell 2. Here you can find all locations for Weapons, Shells, Sidearms, Tarstones, Revered Glands, Synaptic Vessels, and more. You can also track your progress by marking items complete on the map, so you know what you have already finished and do not need to backtrack.
The main dungeons of the game are located at the bottom of the map. There is no in-game map for those interiors, but the items and Beacons found there have been included, so check these as well when searching for something like a specific Tarstone or Revered Gland.
If you mark map pins as completed, those checks stay in this browser on this device. They are not sent to a server. Clearing this site's data, using another browser, or using another device starts the map checks over.