Two bits of add on software that you might like to look at - TYRE is a really good planning program using either Google earth or recently Google maps link is
http://www.tyre.tk/ Second really useful bit of kit is Tripmaster
http://www.webazar.org/tomtom/tripmaster.php?lang=uk That allows you to record where you have been amongst other things. Both are excellent and really significantly enhance the TT.
Regards
Simon E