Hi,

> phone has a 10 sec delay window

I assume it uses sms. The delay window is depending on the software that the SMS provider uses, and can go from less than a second until more than 10 seconds.

If it is vehicle thracking (as I do) you can use separate GPS receiver and a GSM on GPRS network. Also you need a small boardcomputer to handle all. Costs of hardware slicht higher of course But you have real time tracking of a fleet.

For display position on mappoint you need to have a delay of 15 seconds I think.

rgds, Wilfried
http://www.mestdagh.biz