mapinfo to postgis problem

[FX GAMOY]

Hello world,

i am using ogr2ogr in order to translate mapinfo tab files into postgis 
database..

Everything is nice but ....

i work with polylines representing a water network ( system ).. 
i would like to draw on the map the way the line has been vectorized with 
mapinfo.. using some arrows

But this way seem to be sometimes changed by the ogr2ogr translation or by 
mapserver when computing the map.

i will be very pleased  if anybody could give me suggest!

Best regards,

fx