1.digital signal type ------no frequnecy interference 2. competitive price with good quality 3 ... digital signal typeIncluding: one rudder indicator(RD- 0183B), one rudder transmitter (FB-40), Indicator :Power source : DC18-32V,standard:24VMeasuring ... 60°CAdvantage: splash-proof ;anti-shock& impact(10kg), friction resistance Transmitter: Adopt high-precision angle sensor,output NEMA 0183 rudder angle ...