Try It For Yourself!
This gives you an idea of how you can use three different Macintosh software programs to exchange information with your GPS. And I've only touched the tip of the iceberg (so to speak) on each of them. As you experiment with the ones you like best, you'll find all kinds of cool and useful things to do with them.
Maria Langer is a freelance writer and helicopter pilot who has been writing about Mac OS since 1989. She's always looking for new tricks to teach her Macintosh computers and new toys that will work with them. Maria is the author of Peachpit's bestselling book on Mac OS X, Mac OS X 10.4 Tiger: Visual QuickStart Guide. You can visit her on the web at http://www.marialanger.com or listen to podcasts of articles like this one at http://www.marialanger.com/mariaspeaks.