how do i load excel files or SCV file to my gps

You have to save the file as a csv file to load to gps using poiloader see http://www.poi-factory.com/node/25721 .See also http://www.poi-factory.com/node/25743

Welcome to Poi Factory mozartpapa

Thanks. I already have the POI loader. I have UTM coordinates in excel that I want to send to my Garmin gps

Follow the instructions in the second link charlesd45 gave you. http://www.poi-factory.com/node/25743

To follow that link, hold down the "shift" key and then "left click" on the link. What will happen is that you will open his instructions in a new window, leaving this window still open, so you can return here and let us know how it turned out.

UTM is my favorite coordinate system for use with field type GPSr units and paper topo maps while hiking. However, Garmin vehicle type GPSr units insist on longitude/latitude coordinates in decimal degrees and use of the WGS84 datum.

I use the following software to convert from UTM to longitude/latitude, and it also handles translations between different datum types.:

http://earth-info.nga.mil/GandG/geotrans/

You will need to convert the coordinates.