Hi, you probably figured it out, but I will explain it anyway (in case of someone with the same problem as you will be reading this thread in the future).
I must admit, that I have nautical education, so forgive me if I won't use "proper aviation terms".
So first of all basic terms:
- Heading is an angle between the North and the direction your nose is pointing. (Remember that there are few different Norths related to your heading).
- Track is your "course over-ground". You must remember that your aircraft is constantly flying in the fluid. It means that you can point your nose at one direction, but the wind will push you to the side. So the Track is just an angle between the North and the direction you are moving.
In ABRIS "BRG" is the Bearing towards the next steerpoint. You must be aware if the next steerpoint is a waypoint from your flightplan or a target you've just entered or something else that has been selected by you on the chart.
DTA is Desired Track Angle. It is an angle from one steerpoint towards the another (one you've just passed and second you want to reach). So it is a Track you want to reach in order to move straight towards the next steerpoint. Under your chart there is a scale that shows you your XTE (Cross Track Error) - the deviation from your Track measured in kilometers (ofc if you use metric system in your Ka-50).
And the MOST IMPORTANT THING - ABRIS is not fully connected with the PVI-800. If you create a flightplan in the ABRIS, you still have to create waypoints in the PVI-800 in order to fly by autopilot. If you create waypoints in the PVI-800, they will not appear on the ABRIS, so you must create a flightplan if you want to see them on the chart. But funny thing - if you create a navtarget in the PVI-800, it will be displayed on the ABRIS.
"The airports are not counted for the PVI-800 right ?" I don't know what you meant by that. You can enter positions of two airports in the PVI-800.