Thanks very much. That is what I was hoping. Did not want to have to repeat several days hiking just to re-mark some coordinates, although the area is in the Never Summer range, which is strikingly beautiful.
FYI - the datum the Foretrex came with, as you would expect, did not yield coordinates that made any sense on a USGS map. They were way off. The coordinates after the datum was reset are right on in most cases, but in some cases were a few hundred feet from where they ought to be. That could just be because the location of the old track or trail on the map is not quite correct, but that does not explain variations where peaks and highpoints are marked on the USGS maps. In general the trail locations on the USGS maps coincide with GPS readings, unlike the National Forest and National Geographic Trails Illustrated maps, where the trails are often depicted nowhere near where they actually are.
I had a conversation with Raymond Ave, who has written several northern Colorado maps and guides, about this, and his feelings about the TI maps are about the same as mine. They have only gotten much worse since NG took them over. Ray's maps cover the Rawah range, but for the Never Summer, I've had to cut up USGS 7.5 minute quads, make strip maps of them, and laminate them in ultra-thin plastic. If they are copied on the computer with Windows bit map, some of the important details, like shading up to timberline, just don't come through. Learned that the hard way. So for areas further south, will use the original maps rather than TI or USGS copies. Thanks again.