Carry-On Electronics

This battery guide lists pros and cons of the batteries (NiMHs, lithiums, alkalines and more) that power your outdoor devices.

Geocaching is a fun family-friendly way to explore the outdoors. Learn the basics, including what geocaching is and how to get started.

Our article helps you pick the solar charger or portable power technology that’s best suited to your adventure, travel and power needs.

Learn how to train using a heart rate monitor, what your HR max is and how to determine it, and how to calculate and use heart rate training zones.

Learn about speed and distance monitors, GPS fitness trainers and heart rate monitors so you can choose the right one for you.