# $Id: Portfile 20412 2006-11-03 02:14:55Z jberry@macports.org $ PortSystem 1.0 name dgpsip version 1.32 categories comms maintainers nomaintainer@macports.org description Differential GPS over IP communication device long_description On a stationary GPS without a differential correction \ signal, you should see a 20 m average radius "drunken walk" \ pattern. On the same receiver with DGPS corrections and a \ good view of the sky, the error the same receiver with DGPS \ corrections and a good view of the sky, the error should be \ reduced to approximately 2 m average radius. If you've always \ wanted to know exactly where your house is located without that \ annoying GPS "wander," but didn't want to spend the money for \ a DGPS radio, here is your big chance! I'd like to announce a \ fun DGPS hack. I've written a small Un*x server and client for \ redistributing DGPS correction signals over the Net. Basically \ the server grabs the serial byte stream from my DGPS radio and \ sends it off over a TCP connection. The client does the same thing \ but in reverse. The result is that you can receive the local DGPS \ corrections from absolutely anywhere by using the Internet as the \ world's largest extension cord. You'll still need to be within 1000 \ miles or so of San Francisco, California, USA for best results. However \ chances are better error will still be reduced if you are 2000 to 3000 \ miles away. Several respondents from 2000 miles away have noted that the \ remote differential signals have diminished the SA-induced position and \ velocity errors by approximately 3 times. homepage http://www.wsrcc.com/wolfgang/gps/dgps-ip.html platforms darwin freebsd master_sites http://www.wsrcc.com/wolfgang/ftp/ checksums md5 af948d8c485ac84a343c9210f2f05267