open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello,

Does anyone has modelled tide before 1900 ?
I use the Version 7.3 of Telemac and the regional North-East Atlantic atlas for tidal harmonic constants.
It works well for the 2000's , the tide is well reproduced if I compare to tide gauge data or prediction from t-tide program.
but for some years at the same date (6th of september) like 1785, 1789,1801, it does not reproduce well the tide.
Is anybody had the same problem?
I did not try the solution in previous version of telemac to compute in fortran file the prediction of tide but if nobody have a solution I would try it.
Thanks in advance,
Camille