Hi @Aquila,
This is more a question of whether a Nortek DVL can be integrated with the vehicle, because if it can then the vehicle can report its position to QGC via MAVLink.
This post is the only one I’m aware of discussing Nortek DVL integration with an ArduSub-based vehicle, and I’m not aware of any particular changes since then.
If it’s useful, there’s a comparison of some DVL options in this comment, including links as relevant to those with known integrations with ArduSub.