OK, some progress. I dredged up an old revision that I thought was working, and sure enough it still works. It seems that offsetting a map by referring to it this way '7-LaghuPlan-midP3@Laghu' gives the result I want. But inserting that map inside another map, with no other additions, referring to it now as 'LaghuPlanMap-2' breaks the offset map-connection hierarchy. I feel like this should offer me some insight, and a path to some solution. But it is not hitting me yet, unless it is somehow associated with map-levels? It seems to make it difficult to generate a pattern that allows unlimited levels of offsetting, preferring instead to terminate at two levels, as in the Therion Book example. Or is there a creative solution? Details below. Offset of offset - map-connection is submap to submap - looks good so far - rev 47.1.1 map LaghuPlanMap -title "Laghu Cave Plan, Mt Arthur" 9-LaghuPlan-surface@Laghu #entrance pit LaghuPlanMap-1 [-050 000] below #top level offset map Laghu endmap LaghuPlanMap map LaghuPlanMap-1 9-LaghuPlan-underground@Laghu 7-LaghuPlan-upperP1P2@Laghu 7-LaghuPlan-midP2P3@Laghu 7-LaghuPlan-midP3@Laghu [000 020] below #same as LaghuPlanMap-2, but with correct map-connections # LaghuPlanMap-2 [000 020] below #referring to it this way breaks the map-connections # if both above lines uncommented, then the map is unchanged, it still plots correctly endmap # map LaghuPlanMap-2 # 7-LaghuPlan-midP3@Laghu # endmap Offset of offset - selected map to submap - breaks map-connection map LaghuPlanMap -title "Laghu Cave Plan, Mt Arthur" 9-LaghuPlan-surface@Laghu #entrance pit LaghuPlanMap-1 [-050 000] below #top level offset map Laghu endmap LaghuPlanMap map LaghuPlanMap-1 9-LaghuPlan-underground@Laghu 7-LaghuPlan-upperP1P2@Laghu 7-LaghuPlan-midP2P3@Laghu # 7-LaghuPlan-midP3@Laghu [000 020] below #same as LaghuPlanMap-2, but with correct map-connections LaghuPlanMap-2 [000 020] below #referring to it this way breaks the map-connections endmap map LaghuPlanMap-2 7-LaghuPlan-midP3@Laghu endmap Thanks Bruce