hye..now im doing a project with a title 'pet tracker' based on communication..i want make a pet's collar and handheld device..my plan for this project how it works is first customer request at the hand held to know the location of our pet..and the information will be send to the satellite and it will locate our pet and send it back to the hand held devie..i have to use GPS module in this project..but i dont know how much GPS module i have to used..one GPS module at hand held device..and should i put another one at pet's collar?in this project,i use PIC microcontroller..16F877..please help me.