Does GLONASS Affect Battery Life?

When I started using the Garmin Oregon 600, I noticed that the battery life was much less than the Garmin GPSMap 62s. I attributed that to the touchscreen or the GLONASS receiver, which the Oregon 600 has but the 62s does not. I just received the new GPSMap 64s, which is the 62s updated to include GLONASS, and that gave me the chance to test the two under similar conditions. Much to my surprise, I found the battery life of the Oregon 600 to be about the same as the 64s, both with GLONASS enabled and disabled.

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