I use a fitbit and there are a lot of other websites/services/apps that can sync with it. This won't be as helpful for you since you don't have a "smartphone". I use a heart rate monitor app that can sync with fitbit called Digifit and the app syncs with a bluetooth heart rate monitor strap.
You can manually log exercise to fitbit, and you can manually log it using the data from your heart rate monitor. I use to do this before I had a hrm and still do for water exercise (as I don't swim or do water aerobics with my phone).
Fitbit does not use GPS, I don't think any of the fitness monitors do either? The sensors in fitbit are strictly accelerometer--that is why it is so small. The bodybugg/bodymedia have accelerometers and also sensors for body temperature and perspiration and something else? I don't believe they use GPS either. I suspect many people would be uncomfortable wearing GPS all day, I would anyway.
People do frequently use phone GPS apps or devices that sync with fitbit for distance activities like cycling. I know a lot of users who do distance activities use Garmin heart rate monitors. I just use a regular Polar Hrm or a phone app + HRM. There are a lot of options, it is fairly common for fitbit users to use the fitbit for general activity and walking and their hrm for other intentional exercise. Manually logging the activity would work fine with whatever device you prefer.
I am not sure about the other monitors as I have been happy about my fitbit/hrm combo. I do read reviews and am curious, but I haven't used them to know how easy it is to manually log activity or to sync with a heart rate monitor.
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