The Garmin system has been lauded for its accuracy and speed. One may make use of the Wide Area Augmentation System whose accuracy is less than three metres on average or the Differential GPs whose accuracy ranges from between three and five metres. The Garmin differential GPS works by correcting and retransmitting a received GPS signal through its network of towers and beacon transmitters. In order to receive these signals one will require a beacon receiver, a beacon antenna and a global positioning system...[Read more]