Use the Grids | Calculate | Calculus command to retrieve the direction and magnitude information from a 1-grid vector map using the steps below: 

1. Export the direction/angle data.
1. Click Grids | Calculate | Calculus,
2. In the Grid Calculus dialog, click Browse in the Input Grid field to select your grid file.
3. Choose Terrain Modeling | Terrain Aspect.
4. For the Output Grid, click the yellow open folder button and change the Save as type to DAT XYZ and click Save.
5. Click OK. The DAT file will be created with the X, Y and angle data. This data will be in the downhill direction.
2. Export the magnitude data. 
1. Click Grids | Calculate | Calculus.
2. In the Grid Calculus dialog, click Browse in the Input Grid field to select your grid file.
3. Choose either Terrain Modeling | Terrain Slope or Differential & Integral Operator | Gradient Operator.
4. For the Output Grid File, click the yellow open folder button and change the Save as type to DAT XYZ and click Save.
5. Click OK. The DAT file will be created with the X, Y and magnitude data.
3. Combine the data.
   Open the two DAT files in the Surfer worksheet using File | Open in Worksheet. One has XY-Angle information and one has XY-Magnitude information. Copy Column C from one data file and paste it into Column D in the other data file, so that all data is in one file. Click File | Save As to resave the combined data.

Updated September 4, 2020