Can it be enabled by an admin or reviewer?
There are quite a few great puzzle caches around with inactive COs and non-working coord checkers (i.e. evince). In a situation where the CO created a coordinate checker, but it doesn't work anymore, and he/she is inactive, could this built in checker be enabled by someone else? The only other option is to contact a former finder, and some don't want to help, esp for a hard puzzle or if they don't know you.