Using GPS+Accelerometer+SD Card data logging cant write

 after use code check no errors when data  copied sd card comes wrong
first : longitude , latitude  being approximated
second: date , time  copied (zero value ) ( tried write many ways )
 i need

why have following line in code?

code: [select]

  print_float(flat, tinygps::gps_invalid_f_angle, 10, 6);


why don't have when write same in sd card?

code: [select]

  mysensordata.print(flat);


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