With AssistNow Offline, users download u-blox’ Differential Almanac Correction Data from the Internet at their convenience. The correction data is then transferred to the mobile terminal via TCP/IP, serial port, memory card, etc, and can either be stored in the GPS receiver’s Flash EPROM (if available) or in the memory of the application processor. Therefore, the service requires no connectivity at system start-up and enables a position fix within seconds, even when no network is available.
u-blox provides correction data valid from 1 to 14 days. The size of these files increases with the length of the prediction period, from as little as 3 kB to 90 kB. Positioning accuracy decreases with the length of the correction data duration, with 1–3 day data providing relatively high accuracy and 10–14 day data progressively less accuracy. Regular updates help to ensure a high level of position accuracy.
Benefits:
Fast Time-To-First-Fix, even under poor signal conditions
Global coverage
Network operator independent
No additional hardware required
Free best-effort service
Guaranteed QoS option for premium customers
Low CPU load
Available for all u-blox GPS products
Easy to install and use
u-blox wireless modules include an embedded AssistNow client for effortless implementation
Applications:
Personal mobility
OEM and aftermarket vehicle navigation devices
Mobile phones, smartphones, PDAs
Fleet management and dispatch systems
Asset tracking devices
Telecoms and power switching equipment (precision timing)
Personal and vehicle security solutions
Professional products
Personal navigation devices with instant positioning
Print 
E-mail page 
