A GPS pouch is a secure holster aimed to hold your GPS or GLONASS devices and/or radio with the same capabilities. These may or may not have a beacon installed.
Depending on the item meant to be held in the pouch, army pouches can range from small and simple holsters to large modules that can be attached to body armor or backpack.
GPS pouches can be easily purchased online. UARM offers a compact RP™ Radio Pouch that can be securely attached to belts, armor carriers, or backpacks.