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
Preprocessor / user interface (by Gary C. Kessler)  092d01c6a4f2e75513176b22f33a1f05  AIVDM_pre.pl
The AIS Frame Builder block for GnuRadio            c8b7018386f64dd725fde119f406f574  gr-aistx.tgz
A NMEA encoder (binary to ASCII) (C version)        2534dc06c21fe53f45bd2abab96bb6a7  unpacker.c
A NMEA encoder (Perl version by Gary C. Kessler)    52ab60db06525f2230bb4de3ee61a34b  unpacker.pl


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

Good luck!