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@Velocio
They really shouldn't call it "Battery Save" when their own specs actually call it "Ultra Trac" mode.
The savings aren't just from disabling the screen when there isn't a waypoint, etc... but it also will only poll GPS periodically and then use an accelerometer to determine speed and location inbetween the GPS polls.
It should be fine if you're travelling at a consistent speed and direction, but will be less accurate and lossy if the movement is less predictable.
The battery life doesn't come for free, and if you care about the tracking accuracy then you'd probably not want to use it.