On Sat, Mar 28, 2020 at 05:42:26PM -0400, Stefan Monnier wrote:
With power usage, do you believe that
osmand running gps receiver, displaying where you are and navigating
along an already calculated route
takes significantly more power than
osmand running gps receiver and displaying where you are
I don't know. Putting my software developer hat, I'd guess that the
difference is fairly small. And I'm pretty sure that the GPS receiver
power is negligible in this scenario.
Actually, no, GPS power consumption is not negligable in most real
world senarios.
See https://www.usenix.org/legacy/event/atc10/tech/full_papers/Carroll.pdf
In their tests, the found the GPS module responsible for 143.1mW of
power consumption (Table 5, pg. 7) on its internal antenna. While the
display backlight [1] ranged from a minimum of 7.8mW to a maximum of
414mW, with 75mW used by the display when set to center scale on the UI
brightness slider.
So, depending upon one's selected display brightness setting, the GPS
receiver can range anywere from 18.3x more power than the backlight to
0.346x of the backlight, with 'center scale' brightness placing the GPS
chip at just about 2x the power of the backlight.
So the GPS chip is hardly a /negligible/ power consumer based upon the
results of this study.
[1] the display backlight is often quoted as the "largest power
consumer", therefore all the common advice to use as low a brightness
level as possible and to keep it off as much as possible.
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