What kind of battery lasts seven years but not 15 or 20 years?
The kind, I'm thinking, that needs to be certified to work in a wide range of temperature environments. While I imagine that their battery would last longer in many circumstances, they can't certify it for longer without making it bigger, heavier and/or more expensive.
They claim the GPS receiver has 66 channels, which is far more than needed for the GPS constellation, far more than can even be used.
Perhaps it can listen to the European and other constellations? But I wonder why? COSPAS/SARSAT already can't receive the full resolution of civilian GPS receivers - 406 beacons already have to discard a little position precision. Perhaps the other constellations allow for a faster cold-start fix?
I found
this page.
- Speeds up satellite acquisition
- Reduces power consumption
- Reduces likelihood of losing a 3D fix even in urban canyons
- Provide better sensitivity, allowing fixes in dense forests, and even in some tunnels
- Provides better positioning accuracy
It uses only the GPS constellation (and not GLONASS, Galileo or Beidou).
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