Grid Ties
I thought the purpose of and the requirement for grid ties was for retracement and I always try to base all of my boundary surveys on grid, making it really easy to follow. However, lately it seems that a lot of the surveys that I'm following show a grid north arrow but no grid coordinates or tie to a grid monument. Is this keeping the coordinates "in house" on purpose or an oversite?
I might establish control and basis of bearings for a boundary job by reference to a VRN, or by getting an OPUS position for my GPS base station. Neither of these methods involves a local brass "grid monument". Especially in the case of the VRN there is no singular monument to point at. Even if I position my GPS base with an instantaneous autonomous position I'll still have a "grid" basis of bearings. These are all valid means to the intended end.
Tying any survey to a physical brass grid monument would be rather inconvenient in my area. There are very few still in existence, fewer still in GPS'able locations.
