Volvo Penta's own 8xxx-series pod/IPS drive electronics use a proprietary interface rather than a generic NMEA autopilot connection, so Garmin builds dedicated "Access" integration kits like this one to let its Reactor-series autopilot systems and compatible GPSMAP chartplotters talk directly to that drive platform's own steering and engine control electronics - this is the compass/heading-sensor component of that broader integration rather than a complete standalone autopilot system on its own. Detailed technical specifications for this specific kit could not be independently confirmed beyond what's stated in the catalog name, so this description covers its role and context within Garmin's Volvo Penta autopilot integration rather than exact electrical/mechanical specifications.