Go to dig site, Right Click last button (spade) to show HUD and Left Click to cast Survay. Then ROTATE YOUR CHAR, BUT DON'T MOVE in the needed direction and press colored button according to Survey result. Move to other location, do same again.
It is strongly recommended to use GatherMate2 then you'll see all previous or imported dig-points on the HUD. When using GatherMate2 jump onto fragment before gathering! GatherMate2 data accuracy depends on that.
Heads-up Display (HUD)
On the HUD you can also see player arrow in the center and very small red circle that represents survey success range. And ofc all colored transparent overlapping areas that were set by you with colored buttons.