What have people here found in terms of high sensitivity GPS receivers that get a good fix indoors / inside of warehouses / etc?
I've so far tried:
GlobalSat ND-105C:
Pros: Small, Low power, decent fix when outside, inexpensive
Cons: Poor fix indoors, still needs USB adapter
Garmin 18x USB:
Pros: Long extension cable, high sensitivity, good indoor fix, not too expensive for the quality
Cons: Does not play well with OpenWRT gpsd and kmod garmin driver packages
GlobalSat BU-353S4:
Pros: Same format as the Garmin above, long extension cable, high sensitivity, not too expensive, works well with OpenWRT pl2303 driver and gpsd packages
Cons: Does not have high enough sensitivity to get a good fix indoors
Does anyone have experience with additional GPS receivers or even know how to acquire coordinates in other manners such as WiFi or BLERTLS through the use of OpenWRT packages and certain hardware?
The only finding I made so far is, using old and cheap devices indoors is not worth the effort.
I used an ancient eTrex which was nice to get started with geocaching and did quite a nice job in terms of outdoor usage; but dropped significantly in performance when used beneath a roof, let a lone a metal one.
I loved the serial communication though.
It was easy enough to write some script to update the connected routers geolocation on a regular basis.
Good luck!
I'm not sure if it helps, but have you thought about handling the locating process on your smartphone?
Whatever your use-case may be it's relative easy to write an app serving data running in the background.