JMO, but I think part of the problems that you guys are describing in this thread is not the software but the hardware. I am a forester and use a dedicated GPS for work often. I also have a GIS consultant that I trust; he has been an ESRI partner and has now shifted to QGIS, a free open source software. In short, the GPS receiver in your phone is not as good as the receiver on even a cheap GPS. Even with my dedicated GPS, I often find that the GPS point that I just took is now 12-20 feet away even though I have not moved a step. "Supposedly," my GPS is capable of 3 meter (9+ feet) accuracy, but this is 3 meters when everything is perfect, like locked on to lots of satellites that are widely scattered from each other and standing in the middle of a field. If I can't lock on to more than 3 satellites, accuracy is poor. The best GPS with one meter accuracy is a very expensive thing with a whole backpack, but even this is not survey grade.
A GPS based survey involves setting up a fixed receiver in an open area that gathers data on where it is for days, then the surveyor begins from this known point with a metes and bounds survey. No one is doing surveys by running around and taking GPS points on corners with a handheld device. I do this all the time for work, but it is not a survey and is not as accurate. Many surveyors hate GPS/GIS, as one told me, the corner is the pin or other marker described in the deed, not any lat/long or other coordinate system that identifies a point on the earth. A pin is a pin, a set stone is a set stone, etc. Heck, it is also not uncommon for two surveyors to shoot the same line from the same corners and get slightly different bearings or distances, I see this all the time on deeds of two different ages. I think what my surveyor was saying was that the point is to get you to be able to find the actual pin/point described in the deed, not to direct anyone to a specific lat/long that may or may not represent the actual location of the corner on any given day with any given device. That said, I have used my GPS to identify problems with boundaries and then had to call in a surveyor to find the real pin, which he stepped on . . .
All I am saying, is for most of us a cell phone is a great tool that we probably carry all the time (think convenience), but don't expect something that you carry in your pocket and does a million other things to replace a high-dollar tool that gives highly accurate readings only after collecting data for days. I'll bet none of you expect McDonalds to give you the best meal you have ever had, we make sacrifices for convenience.
A good woodsman uses all the tools at his disposal but is not overly dependent on any one of them. If your GPS can get you within 30-50 feet of a nice scape, buck bed, or even a tree for a sit, can't a good woodsman find the desired site from there? Personally, I do not use a GPS or my phone like this, and I don't even use a headlamp most of the time when I am walking in. However, I don't seem to have trouble finding a particular tree on my lease in the dark without them. Granted, this is not the same as hiking 4 miles back in public, but I think you get my drift. Learn your preferred hunting areas with woodsmanship and use the GPS/phone for general locations.
JMO
Hugh