Any working map-based scanner? Halifax

Not a scanner, but see what the silph road has listed for nests.

Please ask niantic directly. They love to help every serious player, and they know exactly what matches to their tos.
Don't forget to tell them which supporting tools you are using at the moment, and tell them your trainer-id.

To be more clear: Using maps is cheating. You get a huge unfair advantage over legal players, and you support a service provider who has many bots walking.