Suggest you speak to a Garmin representative, or visit a real live Garmin shop.
As some have stated, the GNT-10 connects to a NMEA 2000
network and converts some PGN's to Garmin's wireless ANT protocol. Most of those PGN's are standard NMEA 2000 PGN's for data such as position, speed through
water,
wind etc.
As other have stated, and as expected, none of the PGN's supported are the proprietary PGN's that Raymarine use to control their autopilots, moreover one of the standard PGN's used to send heading information to an autopilot PGN 127237 is not listed as supported.
And from the Garmin web shop, it states the GNT 10 is discontinued. If you can source one, you will also need a SeatalkNG to DeviceNet adapter cable as Raymarine use their own proprietary connectors and Garmin does not.
If you peruse the Garmin Quatix 7
web site, it lists the GNT 10 as a compatible device.
On the other hand if you peruse the Garmin Connect IQ Apps
store, the
Boat Data app states that it is not compatible with the GNT 10.
A separate app, Autopilot, which allows you to control a Garmin autopilot, does not list the Quatix 7 as a supported device. In any case it's not going to be able to control a Raymarine autopilot.
So you'll need to sort out the
marketing hype from reality.