As a general rule we have found that light is best if it is low and on the opposite side of the track from the tracker. Unfortunately we can not always pick where the light is going to be and are not under ideal conditions. Use the general rule to start looking but find where the lighting is best for you where you are it will change with time and direction changes and give yourself the best possible conditions sometimes this means looking behind yourself or checking an area that is different from the area that you normally look at. Give Yourself the Best Available Opportunity to Suceed others lives depend on it. Have someone set track across a circle about 20 foot around and have the staff walk around the circle to see where they can see the track the best from you will demonstrate this principle and see some differences from staff to staff.
Reflection is where either tracks reflect more or less light than the surrounding soil.
It could be dirt, rocks, vegitation, a can, bottle, paper, the ridge by fences or when the disk is used in a perimeter etc. Hue is where the hue or color of the track or a portion of it is different from the surrounding area. In this area of the country hue usually involves moisture, for instance a wet or muddy track on blacktop or cement, a spot where mud stuck to the foot leaving a dry area when the surrounding ground is wet and darker in hue, a track made in mud that hasn't dried out as fast as the surrounding ground, a trail through a dew or frost covered area, a leaf that has been stepped on, broken off, etc. Symmerty deals with straight lines and smooth curves and natures tendency not to do things in straight lines or smooth curves. I know as with most laws this is not always the case but it works for us.