Gridding an Aerial Photo - Free Software?

I posted this in Infantry and it was suggested that I try here.

I'm looking for free software to grid vertical aerial photos. i.e. you load a jpeg / tiff file into it, tap in a few coordinating points and it overlays the national grid onto it so you can print a photo which has been gridded and scaled.

I tried a patch for google earth but it wasn't very accurate.

Anyone know of a free program that will do this?

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