I tend to be nervous about our electronic friends....
I have put up two webpages that allow to practice your sextant and almanac skills (with some electronic help).
http://navigator.e-land.on-rev.com/almanac2/test.html
http://navigator.e-land.on-rev.com/Twilight.plotter4/test.html
you will need the revmedia plugin (which is in alpha and a little buggy, maybe).
http://revmedia.runrev.com/revMedia/
Steve