I don't think any GPS is accurate enough to precisely locate a property corner. Also, even it it were, it would be difficult for you to get the precise GPS coordinates for those corners. On the other hand, just to roughly locate the corners, it is possible to use GPS, if you can get the coordinates.
30
3,200 acres.
That would be 3.67 acres.
100,492,920 square feet in 2,307 acres.
100' x 900' equals 2.07 acres.
20900 square feet = 0.48 acres
property: 100 acres 21.25% of 100 is 21.25 acres (21.25/100 x 100). 15% of 100 is 15 acrees. So that 4 people received 85 acres (21.25 acres each), and one received 15 acres.
Answer: 10.8126 acres.
2.3
Answer: 90 acres = 0.140625 mi²
That would most definitely depend on the type of animal you are hunting, and the location of the property. If the 10 acres lies in the middle of surrounding property, or adjoins with a larger parcel then it is a possibility. Generally speaking, more property would be beneficial.
One acre is 43,560 square feet. The conversion would be 57.4 acres.