Carry-On Electronics

Learn how to protect valuable electronics like GPS, satellite communicators and phones from rain, water, dust and more with these tips from REI experts.

How much do runners, cyclists and other endurance athletes really have to gain from training based on their VO2 Max?

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 the difference between a personal locator beacon (PLB) and a satellite messenger, and which emergency signal device might be right for you.

Learn the capabilities, basic functions and key features of handheld GPS receivers and get tips on how to use your new GPS unit.

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