AIS is the revolution in marine navigation With an AIS receiver any yachtsman can identify any AIS equipped vessel within VHF range. The vessels name is displayed with vessel details such as course speed and turning rate. Previously AIS equipment cost more than £100. Now with this book an AIS receiver can be made from a low cost VHF receiver. The modification is simple and for the first time AIS for less than £30.00 is a real possibility.