GIS/GPS Software

Does anyone know of a viewer in which I can load a geo-refrenced file
such as a shape file or geo refrenced tiff file, then let me type in
GPS cordinates to plot on the map ? I basically want to track my
hunting spots like food sources, deer rubs, water sources and stuff
like that. I use a GPS right now to get my cordinates, then I write
them in my notebook. Would be nice to see on a topo map.

I have the georefrenced topo maps ( Tiff files with World files ),
which work because I used them with mapserver, so now I just need a
viewer to load them, and plot my GPS cords.

I dont mind hand typing the GPS cordinates either, it doenst have to
plug to my GPS or anything special like that.


-Jim