Signal tracking device
From Halopedia, the Halo wiki
A scanner is a UNSC detection equipment seen being used by S. Hartley of Delta Teamin Part 2 of the Arms Race video trilogy.[1] The scanner appears to be used for displaying the location of a tracking signal. It is possible that it is used for other purposes, although none are shown.
The scanner appears to contain a flat panel display and emits a beeping that gets faster the closer it is to the target.
References
- ^ Halo Arms Race Part 2