This looks cool. A wifi enabled GPS Navigation system. Yes GOMITE has the the answer for all our GPS needs on iPhone. There are 2 products from Gomite which will make iPhone fully GPS compatible.

locoGPS Wi-Fi Mobile Navigation Server™
Here is what LocoGPS has to say – LocoGPS Wi-Fi Mobile Navigation Server incorporates its own GPS receiver, processor, battery and transmits over an integrated Wi-Fi radio to enable a full mapping solution through a web-based user interface.
Question – So does locoGPS WiFi work with iPhone or iTouch? By going wireless locoGPS Wi-Fi works anywhere in range (meaning within about 10 feet) of most any Wi-Fi enabled device with a supported web browser (such as an iPhone or iTouch).

locoGPS™ Module for the Apple iPhone and iTouch
It is a GPS adapter designed for Apple iPhone and iTouch.
Question – But I thought that the latest 1.1.3 firmware release gives me GPS functionality on my iPhone/iTouch?
Well, the simple answer is not really. The ‘Locate Me’ feature is using cell tower triangulation and WiFi data along with Google maps to give you an approximate (within a few hundred yards) ‘Pin Drop’ of where you are standing after 10 seconds or more. But start moving, or go outside major US metropolitan areas, and well, no ‘Pin Drop’ for you… GPS remains the most accurate locating and directional technology available and typically places you to within a several feet and updates your location in real-time.