I've worked through the last couple of nights to add some long-needed functionality to the ka72.com site.
Most details are on the ka72 forum, but I'll mention the key stuff here too.
1) You can now re-process a file and see the full results without having to re-upload it (see the leftmost column on the Big List page.)
2) Spikes will no longer appear on newly uploaded track overlays (though existing overlays are stuck with them, I'm afraid.)
3) Accuracy of GPX files is improved. All results in my test files (and Nebs validation files) are now within 2.5% or less difference to the Realspeed results.
4) The engine now detects when you have got a GPS that stores data at too long an interval (eg Garmin on Auto mode) and appends a warning to the results calculations.
Now I'm off to the pub to celebrate!
Happy Sailing,
Dylan.
Added today:
1) GPX file identification.
2) No more "Infinity" speeds for bad GPX files.
3) Re-process buton added to quicklist table on home page.
4) Added a Twitter feed to the site for the tech-savvy to be informed of page updates.
5) First files posted from South America. Always nice to welcome a new continent. 
Dylan.
