Garmin has a full-line of computers that can not only tell you what your power output and heart rate is, but can tell you where you’re going, where you’ve been, elevation gain in a given ride and all kinds of critical data to help in your assessment of training rides or races. Data isn’t effective if you can’t access it or clearly see it; Garmin computers are easy to use, easy to read, complete with back-lighting on several models, and they are extremely useful when you’re trying to scout a new route or trying to remember where your riding partner took you on that new loop.