Global Positioning Systems Advantages of multi-frequency, multi-constellation GNSS for Precision Navigation and Guidance     Rod MacLeod KALMAN FILTER FOR GPS DATUM CONVERSION     B.L.Mallesawri,I.V. MuraliKrishna,K.Lal Kishore A Smoothing Algorithm based on Impulse Response for GPS Data Processing     Dr. M. R. Mosavi Land Navigation using GPS - Preliminary Discussions     Swarna Sangeetha GPS for Digital Satellite Image Correction     D. Vijaya Lakshmi,Dr. I.V. Murali Krishna On-Grid - An Initiative to Promote the Development of Local and Regional Real-Time GNSS Infrastructure Networks     Gavin Schrock, PLS G2TS as an aid to fishermen for marine navigation     Dr. Ashok Kaushal,Ravindra Kumar Ecosystem Approach to Building Integrated GPS Solutions for Car Navigation and Other LBS Applications     Anand Ramamoorthy