AVR-Chat

rishi.

If you're concerned about urban areas, you can go for something cheaper
than GPS, and which doesn't need sight of the sky.

you could look for a cellphone base station number
you could try to identify a local FM station

However there are new GPS devices around with very good sensitivity,
which might do the job you want.

You should be able to get the GPS function for less than your budget, but
you may not have allowed enough for boxes, batteries, CPU, etc.

David