iPhone GPS Module

The iphone GPS module allows jail broken iphones to finally have GPS functionality. This module is in development and will be shipping in February. All software is open source and more applications are being written every day. This module gives you the ability to explore all the benefits that GPS on a platform that is small enough to put on a keychain. Plans are already underway for a stylish plastic enclosure as well.
Features:

• Channels: 16
• Update Rate: 1 sample / second
• Acquisition Time: Hot: 4 Seconds, Cold: 45 seconds, Indoor: A long time
• Serial Output: 1 Serial, 1 USB
• Position Accuracy : 2.5m
• Protocol Support: NMEA 0183 ver 2.3

Iphone Software: Requires Jail Broken Phone (tested on firmware version 1.1.2).Software will be open source/community basedFirst prototype (on iphone with 1.0.1 firmware)

[source : justamp]