As soon as you, the posted hunter, reach your hunting spot, you must first of all locate and signal yourself to your fellow hunters along the line.
Once you've located them, you need to define your 30° shooting angles. This is done by taking 5 steps towards one of your line neighbours and 3 steps perpendicular to the direction of the animals' flight path. You will have to repeat this operation on the opposite side, towards your other neighbour.
You can mark your angles in various ways: using local material such as two branches that you plant on either side of your post in the middle of the path. Or better still, by using marking stakes.
You will need to adapt this procedure depending on the lay of the land or the proximity of houses, roads, or other obstacles to shooting.