I start the year in a bad mood ! Unfortunately I have seen, through the experiences of many of you, ignorance, if not incompetence, many sellers iPad. Not only specializes supermarkets, but also among some Apple Certified Resellers ! This caused errors when buying for Christmas, and many of the disenchantment.
Among the information I have reported, Here are some pearls :
- The iPad has no GPS (Apple Certified Reseller).
- IPad Cellular cannot be used without 3G / 4G subscription (retail)
- A SIM card is required for the position with the iPad (telephone operator)
To cite only the most surprising.
All this is COMPLETELY UNTRUE !
I provided, in several sections of this blog (¹) and on my website (²), detailed information about the Wi-Fi + Cellular iPad for navigation. But maybe I have not been clear enough, articles are too long or are not read to the end, or a little too hastily, whatever ? So here I'll correct some misstatements.
iPad Wi - Fi, and iPad Wi - Fi + Cellular
These two models, the first, iPad Wi-Fi, only has Wi-Fi as a means of network connection, and localization is provided by access points Wi-Fi (Hotspots), very random. The second model, called iPad Wi-Fi+Cellular, provides access to the 3G / 4G network using a SIM card and a network subscription (as an iPhone). The possessed a GPS receiver and a three-axis electromagnetic compass that provide highly accurate positioning, serving navigation mapping for car , marine or air applications. Localization can be obtained by alternately access points Wi-Fi, by cellular antennas trilateration, or built-in GPS.
iPad Wi-Fi + Cellular
With the risk of repeating, GPS positioning absolutely does not need the 3G / 4G cellular network, a subscription to this network is not necessary. The A-GPS chip built into this model is perfectly able to acquire satellites in the GPS constellation without the assistance (the "A" for A-GPS) by the cellular network. This assistance provides only acceleration of time to first fix, or accelerated location recovery if lost after passing through a tunnel, for example, through the connection on a dedicated server providing real-time ephemeris of the satellite constellation.
To have crossed France from side to side in a truck and car, with my iPhone as my iPad (using the CoPilot), Wi-Fi and 3G disabled, my position has been lost in a few places in the middle of narrow streets, as in La Rochelle, in the old city. At sea, I have never lost my iPhone with GPS position, even less with iPad.
So do not hesitate to confront the sellers and to teach their job, this will help all users.