Both of these airfields have a triangle shape but the Cameron McIntosh field has been modified like many surviving BCATP airfields were St Thomas Centralia Brantford Hamilton e g My primary authority for the locations of the airfields given in this article is the Air Navigation chart for the area I do not have the chart circa WWII for North Battleford so I decided to accept the existing Wikipedia articles for these two airfields as an authority My interpretation of the satellite images is that Hamlin was the primary relief field R1 for North Battleford Cameron McIntosh The folks at the Commonwealth Air Training Plan Museum in Brandon probably have documentation circa WWII about the location of this airfield Sorry for the long delay in responding