Meindert,

Thank You very much for your answers. The things now are much more
clear to me.

And now I could understand wy the folowing batch of AIS messages seams
me like a encripted message.

!AIVDM,1,1,,A,33M@HUP00OlOi@LD3O=?gvb0000,0*18
!AIVDM,2,1,4,A,53M@HP1s`ThLa22218tpEb22222222222 2221?6@:7374QN9QmADST,0*76
!AIVDM,2,2,4,A,iFH888888888880,2*7F
!AIVDM,1,1,,A,33M@HUP00OlOi@LD3O=?gvd0000,0*1E
!AIVDM,2,1,5,B,53M@HP1s`ThLa22218tpEb22222222222 2221?6@:7374QN9QmADST,0*74
!AIVDM,2,2,5,B,iFH888888888880,2*7D
!AIVDM,1,1,,B,33M@HUP00OlOi@LD3O=?gvd0000,0*1D
!AIVDM,1,1,,B,139OT10036OkBhLVT=aoGpf0L13,0*53
!AIVDM,1,1,,B,139OT10037OkAe0LVSKan7q608Fk,0*58
!AIVDM,1,1,,B,34QB:@002TwjB3lLQD1C:3AN20TQ,0*07
!AIVDM,1,1,,B,34QB:@002WwjBlLQD8S:3=V20S@,0*60

Best Regards

Pascal