From somebody that has never set a marten trap,what do you look for when you set?It always look like somebody randomly wandering in the woods making sets in trees
First ,need to look at the big picture.
We strive to target juvenile marten and avoid adult females.
So I will make sets along timbered drainages that run thru more open country(like old burns,old clearcuts),these timbered drainages are best when they connect core marten habitats(old growth with lots of standing chicots).Marten here avoid open areas so these are natural funnels.Juvenile marten seeking home range will use these areas as travelways as they disperse from family groups in the core marten habitat in late fall and early winter.
You can identify these areas if you fly your line doing a beaver survey,or by looking at aerial photographs(back in the day)
Today google earth is used.Old large growth along rivers (where the ground is drained better) are also good dispersal travelways(natural funnels) used by juvenile marten.Other good natural funnels are strips of land between larger lakes,and dry older growth along eskers that run for miles thru swampy stunted growth.
On a smaller scale,the best sets are those made in good overhead cover(80%) and lots of coarse woody debris on the ground.These are the areas marten seek out to hunt,especially when snow gets deeper.
In short- the better you know your trapgrounds the more marten you can take with less effort and less sets.