They have a vast suite of autonomous capabilities, ranging from remote sensing to telemetry, telemetry intelligence, to sub-probe deployment. Nav platforms are named in accordance with letters of the Greek alphabet. Starting with Alpha (α) which operates just 10 days in front of the Ark (t+10 days), through Beta (t+50 days), Gamma (t+100 days), etc... all the way up to extremely remote ones operating a couple of light-years / many centuries in front of the voyage.