[GRASS-user] ECW Import not matching up

[Adam Dershowitz]

I have a project that has a bunch of different layers.  I have some  
GPS points that all lineup nicely with a map that I had downloaded  
using the r.in.oneearth plugin.  So all seemed well.
Then, I just downloaded a few ecw images from rgis.unm.edu.  I used  
gdal to import them (I have the EWC GDAL plugin installed).  There  
were no errors on import.  GRASS reported "Projection of input dataset  
and current location appear to match".
The problem is that that these images are off from everything else by  
something like 200 m.  These new images are mostly north, and a little  
west of the rest of my data.

Any ideas why this might be?  How can I get these to match up properly?
The project settings are
projection: 1 (UTM)
zone:       13
datum:      nad27
ellipsoid:  a=6378206.4 es=0.006768658

While the imported files contain the following info in the associated  
meta data file:

Spatial_Reference_Information:

     Horizontal_Coordinate_System_Definition:

         Planar:

             Grid_Coordinate_System:

                 Grid_Coordinate_System_Name:Universal Transverse  
Mercator
                 Universal_Transverse_Mercator:

                     UTM_Zone_Number:13
                     Transverse_Mercator:

                         Scale_Factor_at_Central_Meridian:0.999600
                         Longitude_of_Central_Meridian:-105.000000
                         Latitude_of_Projection_Origin:0.000000
                         False_Easting:500000.000000
                         False_Northing:0.000000

             Planar_Coordinate_Information:

                 Planar_Coordinate_Encoding_Method:row and column
                 Coordinate_Representation:

                     Abscissa_Resolution:1.000000
                     Ordinate_Resolution:1.000000

                 Planar_Distance_Units:meters

         Geodetic_Model:

             Horizontal_Datum_Name:North American Datum of 1983
             Ellipsoid_Name:Geodetic Reference System 80
             Semi-major_Axis:6378137.000000
             Denominator_of_Flattening_Ratio:298.257222

So it seems that the import is NAD83.  Could that be the problem?   
Shouldn't GRASS correct this on import?  If not, how can I get GRASS  
to correct this?
If this is not the problem, does anyone have any suggestions for what  
else it could be?

Thanks,


--Adam