Inputing Points in the field

Thanks for getting back so quickly. I am aware of the limitations of gps. In my case I already have the part, fence posts and already existing trees and plants located with their coordinates. What I want to do is walk with the iPad and where I see a plant near a known landmark, place ax “x” and maybe a text note. Later I hope to open that field file on my main desktop Mac and retrieve those field coordinates and place the appropriate model into the Master.