The main pages’ data fields may also be configured to display several different information catego-ries (see pages 25-26 for the complete list). On the Highway Page, let’s change the ‘TIME TO NEXT’field to ‘TIME OF DAY’.To change a data field:1. Press the MENU key to display the Highway Page options.2. With ‘Change Numbers’ highlighted, press ENTER.3. Use the ARROW KEYPAD to highlight ‘TIME TO NEXT’, then press ENTER.4. On the alphabetical list of options, press UP or DOWN on the ARROW KEYPAD to highlight a selec-tion. Press LEFT or RIGHT to jump through the list a page at a time. The scroll bar on the right side ofthe window indicates the current position on the entire list of options. Select ‘TIME OF DAY’ and pressENTER.5. Press QUIT when finished.Press PAGE to see the last page appearing in the main sequence, which is the Active Route Page.Whenever you have activated a route or Follow Track, this page shows each waypoint name along withuseful data for each point. As you navigate the route, the information automatically updates to indicatethe next point along the route. For more detailed information on the Active Route Page, see page 50.As you’ve seen, the primary pages provide map and navigation information. The tour’s last page is theMain Menu page, which allows access to the GPSMAP 172/172C’s waypoint, route and planning func-tions, as well as various operational and navigation setup features, and celestial and tide data.The Main Menu is available from any page, and is accessed through the MENU key.To access the main menu page:1. Press the MENU key twice (or hold down the MENU key for two seconds.).The Main Menu page lists 16 menu ‘tabs’ that are divided into categories by function. You can viewa particular menu by simply highlighting the desired tab, which shows any secondary submenu tabsand options for that tab.You may choose from severaldifferent types of dataCurrentwaypointActive Route PageGetting StartedActive Route Page/Main Menu Page