By default the chart lock is "On" to prevent over-zooming of the chart. Without a chart card in the unit, the basic included high level chart will not allow you to range/zoom in closer. (Which might cause the chart to be inaccurate at some zoom levels) You can either add a chart and gain better details and ranges or you can turn your chart locking "off" in the settings. With the lock off, you can range in VERY close and get right on top of any points that you set. (MENU - MAP - MAP CONFIG - CHART LOCK=OFF) You might also have to change your MAP CONFIG to CUSTOM to customize your map settings in this menu.