projection s57 maps

[Peter Huis in 't Veld]

Hello everyone,

I'm exploring the possibilities of mapserver and I'm a bit stuck on the 
visiualisation of ENC / s57  maps

I use the following script:

 SIZE 400 200
 EXTENT  -1000000 195000 365000 7000000

 LEGEND
  STATUS
  POSITION
  TRANSPARANT TRUE
 END

 WEB
   TEMPLATE  "path to global.html"
   IMAGEPATH  "tmp dir"
   IMAGEURL  "dir"
   LOG
 END

LAYER
  NAME s57
  TYPE POLYGON
  STATUS DEFAULT
  CONNECTION TYPE OGR
  CONNECTION "file name"
  PROJECTION
    "proj=tmerc"
   "ellps=WGS84"
  END

  CLASS
       COLOR 247 507 219
       OUTLINECOLOR  100 100 100
   END
END
 
Requesting this map file using mapserver provides me with in complete 
maps. In case I user OpenEv I get a complete visualisation.

I've the following questions:

   - What type of projection and Extent should I use. using ogrinfo 
provides me with:

             - extent (5.8333333, 51.833333) - (6.0333333, 51.90000000)
             - WGS84 format indiction ( GEOGCS)
            -  WGS84 , 4326 (AUTHORITY)
  
  Furthermore, some more generic questions
  - Can I have multple layers using distinct projections? (Shapefile 
stored in a Postgis DB and S57 maps)
  - Is there a document to understand the projection type and how to 
deal with them?  (I've already downloaded lots of info and I use the 
O'reilly WepMapping)
  - Does the gdal component act differently in OpenEv and Mapserver 
causing the differences in the result?

I hope these questions can be answered, otherwise I maybe have to be 
more specific.

thank is advance

Peter