If you have owned a Garmin GPS you will find the 276C quite familiar-if not, you will catch on quickly. As in the past, it is easy to cycle forward and back using the PAGE and QUIT keys. Zooming IN and OUT on the chart is obvious and a directional keypad is used for navigating around the chart and for filling alphanumeric data fields. The chart page can be displayed with or without data and configured with "north up, "track up, or "course up displays. User-definable pages include a compass page, a highway page, a navigation data page, and a route page. The NAV/MOB key places a man-overboard position on the chart and navigates to it, or, allows you to navigate to other points on the chart. Positions can also be entered on the fly in the same fashion using the ENTER/MARK key.