I can only guess. Footprints have different type of polygon on different map.
Thank you for you work. On old SW I do not see footprints on Nuvi 30,40,50 for Navicom 2013.30. So Garmin changed software.
As say above by dasilvarsa at one time Nuvi 1xxx had some casus. For this reason the Navicom was forced to release a three different map with different PID. It concerned Roads of Russia. Each of this map had own type of footprints polygon for specific devices. The same situation is for some Ukrainian map based on "footprints for all building" cartography - it have both version a 3D and a not-3D.



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