I took some points with a GPS, and I'm trying to convert from GCS to OSGB 1936 British National Grid in SAGAGIS. I'm working with a shapefile. To reproject the vector layer to the OSGB projection I have used Proj. 4 (Command Line Arguments, Shapes).
Once the vector layer is reprojected, I loaded a .tif image to check that the projected points lie in their correct places. I set its projection using Proj.4 --> Set Coordinate Reference System.
However, when I try to overlay layer with the image, and the shapefile with the re-projected data, I can't overlay properly, and only appear the layer with the gps points but not the image.
How can I overlay those two properly in order to check that the points are in the adequate place?