Stand Alone Rudder Angle Indicator System Complete single station RAI system typically used on vessels that do not have a ComNav autopilot or, in cases where a separate RAI system is required (such as Hydraulic Full Follow-up steering systems). The Stand Alone System consists of three components: ComNav Rudder Follower w/50′ cable and linkage kit RAI Distribution Box w/special circuitry ComNav 3″ Rudder Angle Indicator