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Using the iPhone 4 at Sea

Rapidly evolving changes in electronic navigational systems

TongaMy recent experience cruising among the 176 islands of the Island Nation of Tonga has sparked an interest in better understanding portable navigation systems. But before getting into that, it helps to understand the Global Positioning System as it relates to your iOS device.

The iPhone and the 3G versions of the iPad have a specialized GPS chip that allows them to receive signals from NAVSTAR, the US global satellite navigation system. The iPhone and other iOS devices can also ascertain their position from nearby Wi-Fi and cellular telephone networks where available.


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