In Advanced Settings, the Navigation Options parameter defines how the autopilot operates in systems IsoView who have an active license, regarding signal corrections RTK. When value is set to GPS + RTK, the pilot can be engaged regardless of the Position Type of the sign of GNSS. If the parameter value is Only RTK, autopilot engagement will be conditional on signal corrections RTK active, so that Position Type of the sign of GNSS must submit corrections RTK available.
The image below represents the Navigation Options configuration screen.