Finally finished drawing of the turn arrows, so that now they're equal in size to the Primo ones, but don't exceed over digits of the distance and don't hide one another.
Arrows are made for the diMkaWertVRV skin with the tips of WertVRV (thanks!) for 480_272 only. The result is fine enough, but I couldn't check the correctness of all the icons completely.
1. Unzip all the files from the supplied archive to the skin in the folder ui_igo8[_da]\common, replacing the existing ones. Then delete all the diricon... files (bmp/spr) from the skin's folder ui_igo8[_da]\common\night.
2. Open the file navigatemap_480_272.ui in the folder \ui_igo8\480_272\ui\ of the skin, then find the layer:
<layer ui_NavigateMapRouteNavigation x=0 y=-1 h=84 z=51>
<SPRITE SprNMRDiricon y=-1 z=30 iconindex=2 iconmodel="navigation.direction_icon" visiblemodel="navigation.direction_icon.valid" zoom=740>
.....
</ layer>
and replace digits 740 with "1024".
Save the file. That's all!

 
Thanks to AndriyChik