All View 12 parallel channel receiver technology tracks and uses up to 12 satellites for better operation under tree canopy and other situations where a satellite signal may be temporarily blocked. A built in antenna and slim, waterproof case make these receivers easy to slip into a pocket and offer worry free operation in any weather. Four size AA required.
Many factors affect accuracy including atmospheric conditions and satellite location.
Selective Availability can degrade accuracy as much as 100 meters. 30-40 meter accuracy is typical in most situations.