Uniaxial compression tests were made on 72 deep ice core specimens taken from 14 depth intervals between 247 m and 2021 m on the Dye-3 Greenland ice core. Test results give stress exponent values ranging from 2.7 to 3.2, which are in close agreement to the 3.0 measured on laboratory-manufactured polycrystalline ice specimens. These test results are compared with similar measurements made in a field laboratory immediately after the ice core was recovered. The data sets showed no significant differences over the four-year time span. The horizontal velocity profile is calculated for Dye-3 using a strain-rate enhancement factor relationship and using stress exponent and activation energy values measured for artificial laboratory ice. The calculated profile is in good agreement with the results from direct borehole tilting measurements. This is the first time such a close correlation has been affected between laboratory-generated experimental data and field measurements in the analysis of a horizontal velocity profile for a large ice sheet.