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Your Garmin help, please

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    Garmin blog..

    When using both GPS and GLONASS, the receiver has the ability to lock on to 24 more satellites than using GPS alone. This is particularly helpful for users who need reliable satellite navigation in challenging environments such as deep canyons or urban environments where a large portion of the sky is blocked by solid objects. The disadvantage to using both systems simultaneously is a reduction in battery life.

    I can only assumed why, but the gist is that using both GPS/GLONASS take a little more power for a lots more precise lock on.

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    Don't see why it would. 2 or 25 Satellites, it makes no different to the chipset, which if I remember right, is qualcomm, which locks on to both GPS and GLONASS equally. I'd go as far as saying it will be less power hungry since it's finding satellites easier and thus not pushing power through signal to find more satellites.

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    It's different circuits though ain't it, so it's effectively running two GPS circuits (maybe). I still say it's the screen that chews the juice.

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