Use the controls on the map to move around, zoom in (plus) or out (minus), or switch to satellite or hybrid view to see the monument in its surroundings. At the highest zoom level you'll even be able to see most of the actual monuments!
Both 5th Maryland monuments are located near the Sunken Road (Bloody Lane), off Richardson Avenue. The lower icon shows the location of the main monument, and the upper the location of the monument to Companies A & I.