NAV marker transmitter
From Halopedia, the Halo wiki
Template:FOF-1 NAV Marker Transmitters are tracking devices used by the UNSC. They are small devices, relatively the size of a tick. They can be attached to an object and will broadcast the location of that object to a Heads-Up Display calibrated to their frequency.
NAV Marker Transmitters have been used by Spartans during operations.
