Hello Paula, I was Polar user form many years, but when I needed more accurate and faster GPS I switched to Garmin. A have two models Fenix 5 and Forerunner 55. The newer Forerunner have little bit more accurate GPS and built in hearth beat sensor. Sensors for bike are better from Polar not because of accuracy but the way how you can fix them. So for walking I would sill recommend Garmin. Even the not so expensive one. I would suggest also to try how they fit on your wrist as they have different sizes. You can use also the Forerunner 55 as I have. The only problem I have with this model is that the battery in mine doesn't last long and sometimes I deplete the battery completely, which leads to that I have to switch on the running program just to connect to GPS nad get correct time again.
Rocksresort Laax: win a stay for 4 people
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