I’m working on my second application for Apple’s iPhone – an APRS (Automated Packet Reporting System) that takes location data from one of the many APRS servers and displays it on a map on your iPhone. Many amateur radio operators update APRS with location information, as well as NOAA warnings, etc. For more information on APRS go to their web site.
Phase one of the project will enable you to use the GPS position from your iPhone (or an entered one if you’re using an iPod Touch) and display any APRS contacts in a selected radius (1, 5, 10, 30 miles) from your current location. The contacts will be displayed on a Google Map with all the usual navigation (zoom, move, etc). You’ll need a active WiFi or 3G connection for it work.
Phase two will likely add the ability to publish your own location to an APRS server.
If you’d like to beta test this and give me feedback, contact me. I should have an early beta available in August.