You're probably already familiar with the GPS capabilities of your iPhone, and how you can download apps that let the iPhone become a driving navigation system. That is probably the most common and well-known use of the iPhone GPS capability. There are plenty of awesome other apps that use the built-in GPS in innovative ways.
Here is a list of exciting ways to use GPS apps for exploring the world, finding adventure, mapping your trail or just finding an interesting path to the places you want to go.
Developer: Groundspeak Inc.
Price: $9.99 Download on the App Store
Go geocaching. Geocaching is a real-life treasure hunt game. The treasure (the "geocache") is usually just little trinket like a small figurine or toy. The idea is for the person who finds the trinket to take it, and leave a new trinket for the next geocacher to find on their own treasure hunt. You can get started with this new pastime by using the Geocaching app (free, $9.99).
Developer: Trimble Navigation Limited
Price: $4.99 Download on the App Store
Nothing connects you to the great outdoors like hiking. Whether you're trekking through tough terrain or wandering with wild flowers, exploring nature can be rejuvenating. Backpacker Magazine has been helping hikers hit the trails for years, and the Backpacker GPS Trails app continues the adventures for the iPhone generation. Use the app to download topographical maps, find or follow trails, geotag photos and share it all by connecting to your Backpacker account online.
Developer: Fullpower Technologies, Inc.
Price: $0.99 Download on the App Store
Explore your city on foot! Don't let the name fool you, MotionX GPS Drive includes excellent pedestrian navigation tools. In addition to constantly updated maps, the app integrates with Facebook places, Bing search and Wikipedia. You'll find tools for planning a multi-stop tour of any city and excellent destination information for every location along the way. On foot or four wheels, MotionX GPS Drive is an adventurer's best friend.
Developer: Archae s.r.o.
Price: free Download on the App Store
If you like the idea of "check-in to win" but are more impressed with global leaderboards and bragging rights than web 2.0 badges, then you're the type of competition-hungry overachiever that might enjoy the location-based game GeoEmpires. Connect with your friends and build an empire by visiting real places within your city. This game uses the iPhone's GPS to create a virtual world that requires real world actions to win. It's fun as long as your town has enough players.
What GPS apps do you use when you're in the mood for adventure? Drop a link in the comments so we can check it out.