public ShipGroupData Add()
        {
            int key   = GetUniqueID();
            var group = new ShipGroupData(key);

            ShipGroups.Add(group);
            return(group);
        }
        public ShipGroupData Add()
        {
            int key   = ShipGroups.Count > 0 ? ShipGroups.Keys.Max() + 1 : 1;
            var group = new ShipGroupData(key);

            ShipGroups.Add(group);
            return(group);
        }