I'm going to take a guess here that Hans means "What additional components come in the box when it is purchased?"
The basic 276C package includes the GPSR, a USB cable for connecting it to the computer, a AC power adapter for home use and for recharging the battery, a power (low voltage) and data cable with bare wires on the end for use on a boat or motorcycle, a mounting bracket for holding the GPSR in place on your boat or motorcycle, a CD entitled "Trip and Waypoint Manager", and the appropriate user manuals. The basic package does not include any maps, either marine or automotive, other than the basemap which is burned into the GPSR's memory.
The "Trip and Waypoint Manager" program is sort of a stripped down version of the MapSource program that you can use on your computer to upload, download and manipulate tracks and waypoints. It's easier to learn how to use than MapSource itself, which has grown to become a pretty complex program over the years.
If you purchase the optional (at additional cost) automotive kit for the 276C, you get a CitySelect cartography CD, a 12 volt power cable with a cigarette lighter adapter and a speaker, a 128 meg data chip to hold the CitySelect road maps, a beanbag base to hold the GPSR on the car dashboard, and a bracket that holds the GPSR and allows you to tilt and swivel it when it is in the beanbag base.
The CitySelect CD, like all Garmin automotive cartography CD's, includes a copy of the MapSource program. If you use MapSource - which you need to use to move the map segments to the GPSR - then you don't need to install or use the Trip and Waypoint Manager program on your computer.
The contents of the two packages are described better on the Garmin website at this link:
GPSMAP 276C
You can purchase additional accessories for the 276C on an individual basis - the accessories are listed at this web page:
Garmin 276C Accessories
Hope this information is useful.
PanEuropean