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Does it? I thought GLONASS allowed more accuracy not less power. How does it choose between sensors without communicating with both to know either was available? Less sensor, less power, no?
Signals from more satellites == more processing power required = higher battery drain
GLONASS has fewer satellites than (US) GPS, so it'll generally take less power for similar accuracy (to the level that cyclists care about).
For pure accuracy comparions, GPS is generally going to better than GLONASS.
Signals from both GPS + GLONASS = much better accuracy, but two sets of almanac/epheremis data needs to be cached, etc. And a lot more computation to determine the current location. You also have to power the GPS receiver for each system enabled.
Each system has a different way of limiting accuracy for public use. The US system encrypts the lowest significant bits of the timing signal, with the decryption keys only available in specialist hardware. The ~5m accuracy we are used to in commercial GPS systems is all down to the random jitter caused by these encrypted bits.
The Russian system sends the high precision signal 10 times from frequently than the low precision signal, but the format of the high precision signal isn't known/published, so no-one knows how to make use of it.
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Greenbank
I'm not upgrading £££ of powermeters just to get better battery life from them. BLE >>>
Does it? I thought GLONASS allowed more accuracy not less power. How does it choose between sensors without communicating with both to know either was available? Less sensor, less power, no?
ePaper - how do you do quick updates at junctions? I ride around a RAB glancing at my position to know which exit to take because "take 2nd exit" is usually wrong and fails to include motorway on-ramps as exists!
Tracking. Agree.
etrex already gets ~30hr with Lithiums but I want rechargeable AAs if possible. If they just extended it to read ANT+ and made the processing/screen draw faster and maybe TBT nav they might have something decent.
I'd miss the touchscreen. I like scrolling around to see how lost I am...