I want a anroid app. small, so that, I can run in cheaper sets like Samsung GalaxyY gts5360 model that cost about $100. It has GPS LOCATOR. So, application will send back GPS location LAT LONG SPEED ALT whatever [login to view URL] I want to receive it in my PC using GSM modem (usually used for interent connectivity) and show the location on Google Earth. But I also want to use multiple unit's position at the same time on Google earth. So, some kind of ID for each unit should be used. That is up to you.
Max number of units can go up to 10. But better for you to keep provision for more.