GPS · Wifi

Indoor Geolocation technology??

Chandra Jacobs Travel and tech entrepreneur and global citizen

April 20th, 2013

I am trying to do very accurate indoor geolocation, and building a product (tripchi) to help people engage with brands in airports in new and interesting ways. I was wondering what technologies people are using to do accurate indoor geo within 20 feet...or if there are significant limitations that I need to go about.

Michael Brill Technology startup exec focused on AI-driven products

April 20th, 2013

Hi Chandra.  I looked at indoor positioning last year and it's not quite as developed as one would hope - especially on iOS because of highly-restrictive Apple policies on wifi scanning.  Most vendors seem to require professional services to implement (Meridian, Wifarer, etc.) and I'd be wary of creating dependence on relatively expensive technologies that will undoubtedly be built into Android and iOS within a year.

Apple just bought wifislam which had a good Android solution (~ 3 meter resolution) and were working on an iOS solution (~ 5 meter resolution) but I'm sure (a) Android version will get killed, (b) iOS version will get a lot better and (c) it'll find its way into iOS7 (maybe 90% sure on this one).

Clearly with the acquisition, Apple isn't going to relax their restrictions.  There are other approaches but most of them require the site to adopt hardware (e.g., lighting systems) and that's a slog.

Soooooo, it really depends how time-critical this is to you and how much precision you really need.  20 feet is kind of between GPS and IPS... can you get by with GPS inside of airports which assumedly have good coverage?  Do your own analysis, but my gut tells me that by the time you actually integrated an existing solution (at significant cost), you'll see it baked into the os/devices.

As an aside, I spent a ton of time thinking (and some implementing) location-based offer systems... I'd be happy to give you a brain dump.

Vijay MD Founder Chefalytics, Co-owner Bite Catering Couture, Independent consultant (ex-McKinsey)

April 20th, 2013

I was at a client (large storage and retrieval company) and they embed regular intervals with RFID. This allows for cheap and fast ability to locate approximate locations and then get more specific to the pallet or shelf level via either manual labeling or technology -- this varied by the economics of the specific facility and materials stored. Sent from my iPad

Thinh Le Financial Analyst at Ventas, Inc.

April 20th, 2013

Several indoor gps location apps have been done using wifi-assistance, image augmentation etc... One thing to look forward to however is using the Samsung Galaxy S4 which has a MEMS pressure sensor to differentiate different level of floors. If you want to be ahead in the market, I'd suggest working towards this solution since many buildings will often consist of two floors or more. 

- Thinh

Christian Fritz

April 20th, 2013 is one solution. I know the founder/CEO.

Matthew Moore Product / Engineering Co-Founder

April 20th, 2013

It's gonna be wifi of some sort. Look up Walkbase. Or contact me at as we are doing stuff in 18 airports already! Best, Matt -- Matthew Moore Co-Founder & CTO, CrowdMob Inc. Mobile: (650) 888-5962 Sent from my iPhone

Scott Durgin Founder & CEO 440labs

April 20th, 2013

Don Dodge is tracking some of this ... great guy, keen insights. Here is a post from him...

Ken Woodruff Software Architect

April 20th, 2013

Assuming that we're talking about locating a mobile phone the only other widely available tech besides WIFi is Bluetooth,  particularly LE/4.0/Smart.  If you had a sufficiently large set of Bluetooth beacons with well known locations you should be able to triangulate pretty effectively based on relative signal strengths received at the phone.

Charlie Younghusband CEO at Field.Direct

April 20th, 2013

reelyActive, fresh out of the FounderFuel accelerator, is a startup focused in this space.  Contact them at

John Rodley Technical co-founder with exits

April 20th, 2013

Look at these guys  We used them all the way back in 2005 and it was good enough to trigger a museum AV presentation on a windows mobile phone when the user approached a particular exhibit.

Sean Murphy Consulting Data Scientist

April 21st, 2013

To my limited knowledge, you can map out the locations of indoor wifi networks and use signal strength of each to get a relatively accurat(ish) measurement.