Just wanted to conclude that to have rover’s coordinates in NAD83, you can set up a base’s coordinates in NAD83 LLH, as has been already suggested. There’s no need to convert them to WGS84 as the rover would calculate its position relatively to the base’s.
You can check out this Tatiana’s answer regarding the ETRS89 and WGS84 conversion that describes in more detail why it’s possible to only specify the base’s coordinates in required system:
