Tok'ra subspace receiver
From The Stargate Omnipedia
Small, portable unit of Tok'ra construction which connects to the Tok'ra subspace network. Not only does the receiver display all locator beacons in the galaxy, but it has access to all intelligence reports from Tok'ra operatives.
Reckoning, Part 1 - Though the Tok'ra do not trust the S.G.C. with such technology, Jacob/Selmak smuggles a Tok'ra subspace receiver to Earth. Here, they monitor the status of hundreds of Goa'uld ships that are destroyed or taken over by Replicators.