GPS for Dummies.pdf - Engineering Surveyor

Chapter 13: On the Ground with Maptech Terrain Navigator215 Zooming: The toolbar has two icons bearing a magnifying glass: onewith a plus sign and the other with a minus sign. When the plus signmagnifying glass is selected, you zoom in when you click the map. Whenthe minus sign magnifying glass is selected, clicking zooms you out. Changing the scale: Maps can be displayed in either 1:24,000 (more detail,smaller area) or 1:100,000 scale (less detail, larger area). Note the mapscale command in the toolbar that displays a menu for selecting the scaleof your choice.Planning a Trip with Terrain NavigatorIf you’ve followed this chapter to this point, you’ve located a map of FujiMountain. Keep your imagination flowing and plan a hiking trip there. Supposethat your friends gave you some vague directions about taking a series of loggingroads to get to the trailhead. The trail wasn’t very well marked, but whenthey found it, it climbed steeply for a couple of miles to the summit. However,the last time you listened to your friends, the short pleasant hike that theydescribed turned into an eight-hour death march through thick underbrushand straight up a rock face. This time, you decide to use Terrain Navigator toget a better picture of this little outing.1. Look on the map for a trail.You want the one that goes to the summit of Fuji Mountain. (Only onetrail goes to the top.) As you follow it down, you see that it intersectswith an unimproved road — probably the logging road your friends toldyou about.The symbol for a trail on USGS maps is a single dashed line. Lines withtwo sets of dashes indicate an unimproved road.2. Click the Marker tool on the toolbar, move the cursor to where theroad intersects the trail, and click to create a waypoint for the trailhead(the beginning of the trail).The Marker tool looks like a pyramid.This creates a GPS waypoint at that location named Mrk1. Click the nameand rename it Fuji Trailhead.3. Use the Marker tool to create another GPS waypoint at the end of thetrail.This marks a waypoint at the summit of Fuji Mountain. Rename this oneFuji Mountain (see how in Step 2).