Port for external accessories, such as BarCode, RFID
(1). SBAS (Satellite Based Augmentation System). Includes WAAS (Wide Area Augmentation System) available in North America only, EGNOS (European Geostationary Navigation Overlay System) available in Europe only, and MSAS available in Japan only.
(2). Certain atmospheric factors and other sources of error can affect the accuracy of GPS receivers, such as satellite positions, noise in the radio signal, atmospheric conditions, and natural barriers to the signal etc.
(3). With SBAS signal and also affected by atmospheric factors and other sources of error.
(4). Using wireless technology, such as Bluetooth or wireless LAN will consume additional battery power.