Another very useful feature of radar is the "ranging" function. With the ranging rings turned on, you can easily determine quite accurately your distance to land or intended destination. (Radar is an acronym for "radio detection and ranging"). The ranging function gives an accurate estimation of distance to other vessels, buoys, or anything else of interest -- as long as it is in radar range. Also, it is my experience that I often see other vessels on my radar screen before I see them visually, even in broad daylight. The screen gives a 360 degree analysis of what is out there without having to continually crane my neck 360. David Sorenson Duluth ____________________________________________________________ Be there without being there. Click now for great video conferencing solutions! http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTECasZbAPfJZBqNVI1obpXpC2sOl4AmpwYjyAYsWnBDoqlv7OBWYg/