Back from Colonia.
I've heard of the Guardian sites and have been out to a few to check them out. Getting ambushed by that first automated sentinel was mildly nerve racking. This may have been a highly advanced civilisation but their combat AI just isn't up to the task. They're reasonably easy to deal to with the standard loadout on an SRV.
I found a few Guardian Tech brokers near Vargerson and purchased access to the Guardian FSD booster and a few weapons.