In the control room of the SGC, there is a star map that can be used to follow the traveller through the wormhole, know where on the way they are, the destination of the wormhole and so on. I understand that this is mostly to help viewers to visualize the travel through the Stargate. But has it ever been explained what technology is used to get that information?
I think it's highly unlikely to be a built in functionality by the Ancients as the control room in Atlantis does not have such a star map (and why build in the functionality but not use it?). Humans IMHO do not have the technology to create such a functionality.
From the transcript of Stargate SG1, S2E16 - The Fifth Race:
[The Stargate activates.]
SIMMONS Wormhole is tracking… (freaked out, then to Carter) Captain?
CARTER Sir, the computer indicates that the wormhole is leaving our known network of Stargates. It's going outside of our galaxy. Far out.
They were able to tell within seconds that the Stargate left the Milky Way (however, it doesn't seem to know to which Galaxy it's leading as otherwise, they'd probably had mentioned it). How is that possible?