AUTOHELM ST 50 plus - Introduction

Introduction
The ST50 Plus GPS and Navdata instruments are
repeaters that receive
positional fixes via either NMEA or SeaTalk, from the GPS
satellite system
or the Loran/Decca beacon network .
The GPS system comprises of 24 satellites (operating globally 24 hours a
day) grouped into six separate orbits . Up to 5 of the 24 satellites are
tracked at any one time, and the difference between the unique signal
from
each satellite is used by the ST50 Plus GPS receiver to calculate
your exact position .
The ST50 Plus GPS and Navdata
units also incorporate a security feature
designed to protect instruments mounted in vulnerable areas, such as the
cockpit or helm .
Thank you for purchasing an Autohelm product . May we take this
opportunity to wish you years of trouble free operation .