Arduino + GPS

1. Arduino MEGA2596 ADK R3 + NEO-6M GPS Module

Results : 'NEO-6M GPS Module' doesn't work indoor (No GPS signals)

So I brought them to outside, but it doesn't work either.

2. Arduino UNO + NEO-6M GPS Module

Results : 'NEO-6M GPS Module' works outside (not working indoor)

Conclusions : 

Option 1. Make 'outside version' Sound AR
ex) Uljiro - Machine like sounds, Jong-myo - birds and wind

Option 2. Find the way for 'Indoor Positioning System, IPS'
ex) Wifi, Bluetooth, UWB, Ultrasonic wave, etc