Outpost, Bandit Camp and other safe zones are marked on the map (G) as a subtle green circle.
When you enter or leave, "You are entering the safe zone" or "You are leaving the safe zone" briefly appears at the top centre.
Hostile: attacking or drawing a weapon near a safe zone makes you hostile – then the turrets shoot. While you are hostile and near a safe zone, a countdown shows the time left.
Use /safezone to turn these notices off or back on for yourself.
Commands
/safezone