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You need GPS for proper tracking. It only comes on when you start a session so will not be continually draining power.
Therefore consider the following:
Fitbit Surge
Moto 360 Sport
Sony Smartwatch 3
Garmin Forerunner 225 or 235
The Sony has no built in heart rate monitor, but you could use a chest strap
The Sony, Moto and Fitbit are not suitable for swimming
The Sony and Moto are not suitable for sleep tracking due to battery life |
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