I can't find Garmoyle on any map ( and I've checked some very detailed ones of Belfast and area). However two refs in Mary McNeill's biog of Mary Anne McCracken: 1. p. 34 "the Pool of Garmoyle" and 2. p.306 " Garmoyle, the deep pool in Belfast Lough ...is called Moore's Hole to the present day". As the River Lagan is mentioned in the first ref this places Garmoyle very close to Garmoyle Street, near Greencastle in N Belfast from where Henry Joy was to rendevous with a ship for America and also near Carickfergus where he was captured on the 7th of July '98. All this ties in in with his final few days of freedom. The name may be derived from "Garbh Mael", "rough hill".