Some C and CC sites offer a 3 hour service stop over for use of facilities including emptying of black tanks (you must be a member to make use of this facility). The map shows locations of those sites which have Motorhome Service Points. Not all these sites can be guaranteed to have easy access if you have a large vehicle. The black markers are C and CC sites, Yellow for Caravan and Motorhome Club sites with service points (overnight stay required). White pins indicate other 'to the ground' black tank emptying points