Can someone point me to info that would clarify why my Tbolt's self survey puts my house (AFAIK ~920M ASL, 13N 77.35E) in the Pacific ocean, south of Vancouver and west of Seattle and about 10 meters under water. I am doing something wrong for sure! My sons iPhone gives me right co-ordinates but it's way off the altitude. Regards -- Raj, VU2ZAP Bangalore, India.