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By the way, steering does reaquire teh reacquire the extant BDESs BDESes at the beginning of each steering iterations, so it isn't true that over a long period of steering, such a in GOF, that the real values drift from those steering has recorded. The problem is confined to the time it takes steering to make one orbit correction calculation.
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ref_strshr:str_cor_db_in.for
This function gets the extant bdes secondary values of the corrector magnet`magnet
database. If it is called with INIT argument it sets up the dblist ptrs
for susequent subsequent non-INIT calls. Its primary job is to set the global array
"BDES" - steering's understanding of the extant settings of the correctors.
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Care however must be taken not to set the BDESs BDESes to values which exceed BMAX. This condition is nominally checked in each steering method's function (like STR_RMS and STR_SVD), but now, since it may have changed, it has to be checked again.