The Rotax jet drive controls jet thrust and direction using a “Reverse Bucket”, sometimes called a “Reverse Gate”; the above-mentioned video fully explains it, but how this bucket is controlled depends on the year model of your boat.
Early version of the Vortex, 2015 and 2016 boats primarily have manual control of the bucket. There is a large “Osprey” gear shifter, that manually moves a large cable, that moves the reverse bucket manually.
2017 and later model boats have an electronic servo that moves the bucket, that is being controlled by a smaller, easier-to-use lever, called a “Levorsi” lever. This feature is dubbed “Intelligent Neutral/Reverse”, or “iNR” by BRP, or sometimes called “E-Reverse”, short for “Electronic Reverse.” (The feature was available as an option on earlier boats, but not often fitted.)
The manual system is typically reliable, but not as easy to use, nor as controllable as the later iNR systems. Additionally, when in neutral, the manual system tends to creep forward or backwards, and is never perfectly balanced, whereas the iNR system allows you to actually make minute adjustments right on your screen in real-time, and “dial in” your neutral, allowing you to make the boat sit completely still, or move forward or backwards very slowly, at your choice.
Each system has its benefits and liabilities, but in general, the iNR system is superior, aside from added issues of reliability, due to another electronic module being used, which of course, can always fail.
You can determine which you have simply by looking at your gearshift lever, here is a guide showing you how:
https://www.facebook.com/groups/ChaparralVortexBoatOwners/posts/1734999546805790/