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I wonder if the maps supplied and the GPS programming have the spheroid and datums matching? Depending on what the maps were drawn to, this can easily make errors anywhere from zero to multiple kilometers, depending on where you are. The US military is trying to standardize theirs to WGS84 (last I heard), but many of the older ones are NAD27 for North America, and I don't know what they use in Germany or the rest of Europe. There are probably over 100 different datums in use, and the map must match the setting of the GPS configuration, or your reported position will not be as accurate as it should be. There isn't any easy way for the user to tell with what we have that I know of.
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