Raymarine ST3000 Owner's Handbook Manual page 7

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With an optional SeaTalk/NMEA interface (part number: E85001)
the wheel pilot can also be used with any navigator or position sensor
transmitting NMEA 0183.
The ST3000 can be calibrated to suit each installation. This can
provide optimum performance with many types of boat and
steering systems.
ST3000 wheel drive unit
The wheel drive unit is attached by a single pin to a clevis
permanently fixed to the cockpit structure. Drive is transmitted to the
wheel by a tensioned toothed belt. A lever operated eccentric bush in
the drive unit mounting arm enables belt tension to be released to
facilitate manual override by allowing the belt to slip. The drive
disengagement system is both effective and reliable.
CAUTION:
The ST3000 is recommended for wheel steered boats up to
7000 kg (15,000 lb) displacement. Above this limit and for heavy
duty applications, such as single handed racing or long distance
ocean sailing, we recommend one of the more powerful
Raymarine autopilots (such as the ST5000+ system or
Type 150/400 course computer).
ST3000 Wheel Drive Autopilot - Owner's Handbook
track information, from a navigator, can provides waypoint
control from the autopilot
boat speed from a speed instrument can provide optimum track
keeping performance
SeaTalk compatibility also allows additional fixed and hand-held
autopilot control units to be easily connected at secondary
steering and control positions