As posted in this thread, Map Tacks is compatible with GS. I'm not sure if that's the one CQUI uses or not. For those longing for CQUI, but are already playing with GS. I recommend trying out Sukritact's Simple UI Adjustments and Extended Diplomacy Ribbon both of which have been updated to run with GS. Other Mods are also being listed in that thread. Feel free to check them out and/or add your own findings!