Now use Google earth on your mobile for free using this free software download.
Using this software, airtel wont reduce the balance for using mobile google earth(gmap) in your mobile. so the data transfer through GPRS is free.
This trick is still working with mobile phone that i have checked.If you face any problem feel free to ask.
Download: http://www.4shared.com/get/65244397/bf67a47a/gmaps-220-m2_L1.html
