Chapter 1: Introduction 1Chapter 1: Introduction1.1 OverviewThe RayData is a multi-function digital display, providing a clear displayof important navigational information either above or below deck.The RayData can be used in two ways:• As a stand-alone unit, with depth and speed sensors, to displaydepth, speed, temperature and log information.• As part of a larger system, sharing data with other instrumentsconnected via a SeaTalk® interface, and/or receiving NMEA 0183data from other equipment. Such a system may include more thanone RayData.Most of the standard data values can be displayed in a single-linereadout, with easy to read 1” (25mm) high digital characters. In addition,a three-line display showing depth, speed and temperature can beselected. Other displays show two to four items of related data on thescreen at one time.Operation of the RayData revolves around a “Chapter and Pages”concept. There are four chapters, each with multiple pages and sub-pages containing related information. The chapters are Depth, Speed,Nav and Setup; each of the first three of these is accessed using its owndedicated key. Screen prompts guide you through the various pages,making the RayData an easy instrument to use.Many defaults for the data displays can be set as required, so that, forexample, information is presented in the preferred units.The RayData keys are always lit, taking the guesswork out of night-timeuse. The display can be backlit in low light conditions, and the lightingintensity and the contrast can be adjusted.The unit is lightweight and waterproof.