Mobile position reporter

Hello,
I have an idea that is useful in many ways
Requirement:
Send out the position (captured from GPS) of the phone to the pre loaded phone numbers in one of the following conditions
1. When the phone is not at all moved for 24 hours (duration can be changed)
2.
 When the phone is not at all moved for more than 6 hours (can be 
changed) and battery is in the last 2-3%, phone can get switched off at 
any minute
Use of this:
1. Old and single persons at home in trouble, unable to move
2. Accidents not noticed by any one
3. Killings/assaults/rapes etc that makes the person unable to move
Message/mail/whatsapp should go to the pre-loaded numbers such that further action can be taken. 
 Looking for the inputs to improve it further, please comment on it before starting the development of an android program.
Thanks
Venkat (venky.bel@gmail.com)
08970831465