androrossi:
- Is correct to use that Can-Bus board to send data??? The structure of can bus message is the same of NMEA2000 message???
Yes, you should be able to connect an Arduino to a CAN bus through this board. However, bear in mind the actual traffic load in the bus and the limited computing power of an Arduino. If you just want to develop a "sender" application it's should be OK.
- Is there any library that I can use???
No free or open source library if I remember well. Working with NMEA2000 typically requires you to buy their specs.
Hope this helps,
Daniel.