Physical location of the ODU antenna expressed as longitude, latitude, and altitude. The string shall have 31 characters in the following format: <xxxx.xxx>,<a>,<yyyyy.yyy>,<b>,<zzzz.z>,M where x, y and z represents digits, a=N or S, b=E or W, Reading the digits from left to right: 'x' 7 latitude digits; x digits 1-2 contain the degrees, x digits 3-7 contain the minutes in decimal; 'y' 8 longitude digits; y digits 1-3 contain the degrees, y digits 4-8 contain the minutes in decimal; 'z' 5 altitude digits; meters above sea level in decimal; '.' is the decimal point; ',' is the field separator; 'M' is the indicator for altitude meters. This format is a modified subset of the NMEA 0183 (National Marine Electronics Association, Interface Standard) format for Global Positioning System Fix Data. This location and the satellite position are used to calculate the RCST-satellite path delay. Note: The system.sysLocation object of MIB-II provides physical location of the IDU unit.