Many GPS Tracklog readers know that you can make your own maps for your GPS, but we're just beginning to see entrepreneurs marketing such products. I recently came across Snow Ranger Ski Resort Maps for Garmin receivers, which are available for Colorado, New Mexico and California. The Snow Ranger website provides additional details, including a list of available resorts.
The price is right, at $4.95 per resort, or $29.95 per set, and they can be downloaded online. I was a little surprised though when, browsing the product guide, I discovered that using these maps will overwrite other maps on the unit. This means that you probably need to take your laptop along if you're using your GPS to navigate to the resort via City Select. This limitation on home-made maps can actually be overcome using techniques described in my book, GPS Mapping. It implements a simple modification of Garmin MapSource, and that may have been a little further than the developers were willing to go!