I used a map generated by Star Atlas Pro to align two images one a mosaic of the Vela SNR and the Cometary Globule CG4. Both images are in NII.
Large image here 4MB
http://d1355990.i49.quadrahosting.co...1/VSNR_CG4.jpg
Note how CG4 'points' at the position of the pulsar in the Vela SNR.
Bert