You are approaching unfamiliar shores after a lengthy passage at sea. It's still daylight. Navigation has been by dead reckoning until recent landfall. Because you have no GPS or your unit is not working, and you don't have a radio direction finder (RDF), you expect to slip into the harbor with the aid of visual bearings and radar . . . but the shores and harbor are blanketed by fog. To make things more difficult, the radarscope image does not look anything like the land outline on the chart! How do you identify the land forms and objects for a fix?
Your boat may have a low profile, therefore limiting your radar range. The higher your antenna is located, of course, the longer the range (see figure 1).