Thanks for downloading the AIS BlackToolkit! This directory contains:

The AIS transmitter in form of GRC graph            a1e4b54db83fb895a3c94493126bb318  AiS_TX.grc
The AIS transmitter in form of script kiddie script 52540b46f316ee460f4684a262132d36  AiS_TX.py
An AIVDM encoder supporting the main message types  056ac09822b342da296617ba7b4055dd  AIVDM_Encoder.py
The AIS Frame Builder block for GnuRadio                                              gr-aistx
A NMEA encoder (binary to ASCII)                    2534dc06c21fe53f45bd2abab96bb6a7  unpacker.c

Remember to install GnuRadio and gr-aistx first. A short description is included in each file's header.

Good luck!