A cheap system would be uhf cb radios that have limited range.
Just give them a checkup call every so often and if they dont respond, you
know they have gone out of the range. Install repeaters to manage the range
boundary.


"mdavila78" <davila.milton@gmail.com> wrote in message
news:1157076539.437861.124020@74g2000cwt.googlegro ups.com...
> Hi there,
>
> I was wondering if somebody knows how to monitor or track a person
> location.
>
> I have a farm with many employees, the problem is that sometimes there
> are some employees who just "disappear" from the farm.
>
> I would like to find some kind of device that would allow me to monitor
> their position in the farm.
>
> Thanks for your help,
>