i used to do all my old companys golf courses, and whilst i didn't run anything like moleys amount i had between 100 -150 traps set on difrnt courses.
I couldn't mark them with the useual sticks/canes or wire tealers, because of the grass being cut evryother day, pluss so many members of the public on the course , not just golfers , but dog walkers as well.
I found the best was ground marker paint , it comes in a big airasol can , i liked the blue one , but it dont realy matter what colour. just a quik squirt on the ground near the trap
now some of you may laff hear, but i als