When a Mariner's Compass is this large, you can cut the pieces (adding the seam allowance) - I took a course where we did this, tracing/printing each pattern piece onto freezer paper (minus the seam allowances). Then we ironed this onto the fabric and cut out each piece adding the 1/4" all the way around. This stabilized the fabric pieces and it was so easy to join them all to make the centre compass part with background.
The teacher had a special technique for insetting the pieced centre into a larger background to make the full square. Your pattern as drawn wouldn't need to do the special technique...