I have noticed, that files generated by my device contain duplicates (time, 4th column), i.e.
202***,T,170226,075106,46.474680N,011.803118E,2417*,4***,0**,3D,SPS ,1.2**,0.9**,0.8**,*********
203***,T,170226,075107,46.474680N,011.803119E,2417*,4***,0**,3D,SPS ,1.2**,0.9**,0.8**,*********
204***,T,170226,075108,46.474681N,011.803124E,2417*,3***,0**,3D,SPS ,1.2**,0.9**,0.8**,*********
205***,T,170226,075109,46.474683N,011.803130E,2417*,0***,0**,3D,SPS ,1.2**,0.9**,0.8**,*********
206***,T,170226,075107,46.474684N,011.803136E,2417*,0***,0**,3D,SPS ,1.2**,0.9**,0.8**,*********
207***,T,170226,075108,46.474688N,011.803145E,2417*,0***,0**,3D,SPS ,1.2**,0.9**,0.8**,*********
208***,T,170226,075109,46.474690N,011.803154E,2417*,0***,0**,3D,SPS ,1.2**,0.9**,0.8**,*********
209***,T,170226,075110,46.474691N,011.803164E,2418*,0***,0**,3D,SPS ,1.2**,0.9**,0.8**,*********