diff --git a/tsg_io/readTsgDataSDF.m b/tsg_io/readTsgDataSDF.m
new file mode 100644
index 0000000000000000000000000000000000000000..33422284c88c5608145e35413e6a9e779e4b104a
--- /dev/null
+++ b/tsg_io/readTsgDataSDF.m
@@ -0,0 +1,140 @@
+function [error] = readTsgDataSDF( hMainFig, filename )
+% readAsciiTsg( hMainFig, filename )
+% Function to read TSG data in SDF format
+% (standard ORE-SSS format until 2005)
+%
+% Input
+% -----
+% hMainFig ........... Handle to the main user interface
+% filename ........... Data filename
+%
+% Output
+% ------
+% error .............. 1: OK - -1 : an error occured
+%
+
+% Get the data from the application GUI
+% -------------------------------------
+tsg = getappdata( hMainFig, 'tsg_data');
+
+% Get the fieldnames of tsg structure
+% -----------------------------------
+tsgNames     = fieldnames(tsg);
+nbFieldNames = length( tsgNames );
+
+% Get NO_CONTROL code value
+% -------------------------
+NO_CONTROL = tsg.qc.hash.NO_CONTROL.code;
+
+% Display read file info on console
+% ---------------------------------
+fprintf('\nREAD_ASCII_FILE\n'); tic;
+
+% Open the file
+% -------------
+fid = fopen( filename, 'rt' );
+
+% Check file
+% -----------
+if fid == -1
+  msg_error = ['TSG_GOSUD file_lecture : Open file error : ' filename];
+  warndlg( msg_error, 'ASCII error dialog');
+  sprintf('...cannot locate %s\n', filename);
+  error = -1;
+  return;
+end
+
+% Display more info about read file on console
+% --------------------------------------------
+fprintf('...reading %s : ', filename);
+
+% SDF format has no header
+% Columns are: 
+% ? call_sign cyc_mes yyyymmddHHMM 100*latx 100*lonx 100*ssjt 1000*ssps
+% ---------------------------------------------------------------------
+format = '%s %s %s %s %d %d %d %d %d';
+
+% Read the data in a cell
+% -----------------------
+cellData = textscan( fid, format );
+
+% Check the file is for a single ship/trip
+% ----------------------------------------
+nrecords=length(cellData{8});
+call_sign=char(cellData{2}(1));
+cycle_mesure=char(cellData{3}(1));
+
+if ~isempty(find(call_sign(ones(1,nrecords),:)~=char(cellData{2})))...
+        | ~isempty(find(cycle_mesure(ones(1,nrecords),:)~=char(cellData{3})))
+  msg_error = ['TSG_GOSUD file_lecture : Open file error : ' filename];
+  warndlg( msg_error, 'SDF error dialog');
+  sprintf('...file %s contains data from several ships/trips\n', filename);
+  error = -1;
+  return;
+end
+
+% Fill TSG attributes and variables
+% ---------------------------------
+tsg.SHIP_CALL_SIGN = call_sign;
+tsg.CYCLE_MESURE = cycle_mesure;
+
+tsg.report.tsgfile = filename;
+sec='00';
+tsg.DATE = cat(2,char(cellData{4}),sec(ones(1,nrecords),:));
+tsg.DAYD = datenum(tsg.DATE,'yyyymmddHHMMSS');
+tsg.LATX = double(cellData{5})/100;
+tsg.LONX = double(cellData{6})/100;
+tsg.SSJT = double(cellData{7})/100;
+tsg.SSPS = double(cellData{8})/1000;
+
+% Fill external data variables
+% ----------------------------
+ext=find(cellData{9}~=0);
+if ~isempty(ext)
+    next=length(ext);
+    tsg.DATE_EXT = tsg.DATE(ext,:);
+    tsg.DAYD_EXT = tsg.DAYD(ext,:);
+    tsg.LATX_EXT = tsg.LATX(ext,:);
+    tsg.LONX_EXT = tsg.LONX(ext,:);
+    tsg.SSPS_EXT = double(cellData{9}(ext,:))/1000;
+    tsg.SSTP_EXT = NaN * ones(next,1);
+    tsg.SSPS_EXT_QC = int8(NO_CONTROL) * int8(ones(next,1));
+    tsg.SSTP_EXT_QC = int8(NO_CONTROL) * int8(ones(next,1));
+    type='WS  ';
+    tsg.SSPS_EXT_TYPE = type(ones(1,next),:);
+    type='UNKN';
+    tsg.SSTP_EXT_TYPE = type(ones(1,next),:);
+    date_anal = '19500101000000';
+    tsg.SSPS_EXT_ANALDATE = date_anal( ones(1,next), :);
+    nbottle = '0   ';
+    tsg.SSPS_EXT_BOTTLE = nbottle( ones(1,next), :);
+end
+
+% populate tsg.file structure
+% ---------------------------
+[tsg.file.pathstr, tsg.file.name, tsg.file.ext, tsg.file.versn] = ...
+  fileparts(filename);
+
+% Perform some automatic tests
+% -----------------------------
+automaticQC( hMainFig );
+
+tsg.file.type = 'SDF';
+
+% Save the data in the application GUI
+% ------------------------------------
+setappdata( hMainFig, 'tsg_data', tsg );
+
+% Close the file
+% --------------
+fclose( fid );
+
+% Display time to read file on console
+% ------------------------------------
+t = toc; fprintf('...done (%6.2f sec).\n\n',t);
+
+% Everything OK
+% -------------
+error = 1;
+
+end