Hello, I have P3 Adv. I am using Ipad2, without sim card. After 400m, its disconnecting. I cant go far.. Maximum is 400M. Please help me whats the problem I have several questions 1) So what do you prefer? is it about my area or there is a problem? if i order external GPS, Will it fix my problem or not? 2) if I use simcard, will my problem fix? 3) if I use ATTI, after 400m will my connection again lost?