On Sat, 18 Feb 2017 20:14:28 -0800, Jeff Liebermann wrote:

CellTracker:
http://people.csail.mit.edu/bkph/CellTracker

Nice app, but it does NOT show the lat-long of the local Verizon cell
site. See attached screen grab:
http://802.11junk.com/jeffl/crud/CellTracker.jpg

Thanks Jeff for installing that app, which isn't on F-Droid or Google Play,
so we both took a risk in doing so (I'm not sure how to ameliorate that
risk, but that's the topic of a different Android thread).

I've only used that MIT CellTracker for a day, so take everything below
with a grain of salt but look at this screenshot first:
http://i.cubeupload.com/407ihh.jpg

That MIT CellTracker app does appear to list two GPS locations:
1. Where you are
2. Where the connected tower is

That first GPS location it probably gets from our GPS receivers, while the
second GPS (which it calls "NMAP") location is likely from a lookup
database.

Note from the screengrab that the GPS is on and running. The "WIFI
Lat-Long" is the location of my house, not the local cell site. I
don't know where my Lat-Long came from (probably Google Maps
database).

Sometimes it says "NMAP NOT FOUND" as your photo shows, but other times it
says "NMAP" and then the GPS location and height of the tower in meters.

What I don't like about this MIT CellTracker is that it reports signal
strength in ASU and not in Decibels (yes, I know, it can be converted).

However, what I like about this MIT CellTracker non-Google-Play app is I
can see, visually, the documented cell towers bouncing around, even when I
use my signal booster micro tower.

Here's an edited example of what a user might see of that bouncing:
http://i.cubeupload.com/ZHepme.jpg

Celltracker for Android 5.0 on a Moto G v1 phone running Android 5.1.
I'm on Android 4.3 Samsung Galaxy S3, T-Mobile, in the boonies near you.

After two days, I've whittled down the good freeware to 4 applications:
http://i.cubeupload.com/OwXjWZ.jpg