Two parts. First, friendly Pteraxii, Infiltrators, Rangers, Serberys Raiders and Serberys Sulphurhounds units gain the Recon Augury keyword. Second, Recon Augury units gain Enhanced Augurs: in your Shooting phase the unit can select one visible enemy unit within 12\", and while that unit is analysed it has +3\" detection range.
Read the list carefully, because the exclusions are as informative as the inclusions. Skitarii Vanguard and Sicarian Ruststalkers are not on it β only Sicarian Infiltrators from that pair. So the keyword lands on your fast, forward, screening units and not on your close-range brawlers.
What the rule actually does is push a unit's detection range up, which in 11th edition is the mechanic that governs being seen and being shot. That makes this an anti-hiding detachment rather than a damage one: you are dragging concealed units back into the open so the rest of your army can act on them. Whether that is worth a Detachment Point depends heavily on the mission, and it is at its best where denying enemy actions and secondary scoring decides the game.