I'm I allowed to post this ? If not please delete.
I wrote small software:
Personal Sail Compuer Lite is FREE mobile software for all sailors and other nautical enthusiasts, who wants some statistics on boat speed and angle of sailing against wind and target. It uses built-in GPS receiver of mobile device for tracking boat position, Wind and Target data can be input manually. Inovateive display provides all important data on one composite Graphical Display. Speed graphs and polar graphs are provided in LITE version for last 30 minutes.