Garmin GPS 48 Owner's Manual - Page 25

Marine Database (cont) Lit and unlit navaids are designated by the primary color. The navaid symbol will have the first letter in the primary color displayed in the symbol. Information about the navaid is contained in the navaid label. The navaid label can be activated two ways, either by reaching the label zoom scale set in navaid setup (see page 27) or by panning the map cursor to the navaid (see page 22). The navaid label contains an abbreviated description of the navaid. Lit Navaids have a description string with two required parts, type of light(s), color of light(s) and an optional third, period of light(s). There are many different light types; fixed, flashing, occulating and directional are just a few of these many types. There are 7 primary light colors portrayed in the unit; White, Red, Green, Orange, Yellow or Amber, Violet and Blue. Unlit Navaids can either have a normal worded description such as "TR ON PILE", or a special designation code for the shape and color within the description string. Fog Signal labels include type of sound, whistle, bell, horn, siren or diaphone and the sound characteristic, normally blasts per time. There may be an optional field showing the duration of the blast. Radio Beacons act as short range electronic navaids. The label includes their operating frequency and possibly the Morse Code characteristics assigned to that radio beacon by the Coast Guard. Racon is an acronym for RAdar beaCON. The label identifies the racon station by a series of dashes and dots. When triggered by a radar signal the racon transmits this coded reply which will appear on the radar display. REFERENCE Marine Database Lit and unlit navaids are designated by their primary color. The beginning letter of the primary color will be displayed in the symbol. W = White R = Red G =Green Y = Yellow or Amber O = Orange B = Blue or Black V = Violet 21