Customer Service Center

Environment/Versions Positioning Application User Defined Data GPS and/or GLONASS Answer UDD is an optional ASCII text file that supplements or modifies the data specified in the signal sources files UDD can be used to produce conflicting data, for example a user could: Enable the 'Sat Orb data file' with satellite 1 in Position "A" Enable the 'Eph Nav data file' with satellite 1 in Position "B" Enable the 'Alm Nav data file' with satellite 1 in Position "C" The above configuration would mean the following: Satellite 1 is physically located in Position "A" Satellite 1 broadcasts Ephemeris data to suggest it is in Post ion "B" All other satellites broadcast almanac data to suggest satellite 1 is in position "C"