Need a GPS based solution to measure land area

Metalspree

Skilled
I am on lookout for a GPS based solution to measure land area. My requirement is that my new work site is hilly and its practically not possible to measure the land by tape. It's become a hectic task for me to make payment to workers. Let's say they have done work for about 10 Acres and in reality its just 5Acres, so now i want a device to measure the area via GPS
One of the devices i have come across is the Garmin 78S but it is absurdly priced in India @30K.What are my alternatives??
 
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