Questo Link non esiste nella tua lingua, Vedi in: English (en),
Oppure utilizzare Google Translate:  

http://edn.link/amazongpsarea

This link takes one to Amazon to view a list of GPS-based area measurement devices.  We have no particular recommendation.  This is a starting point for the concept of area measurement.  Note that there are some that have more capability for international use - units of measure, language, etc.