Well, it did turn out to be trickier than expected. With either HGT_DP = 0 or "Disable 3D Models" option ticked the GENERIC_MANMADE polygons are not displayed at all in both navigation and explore modes on Nuvi 1300. With HGT_DP being any value =/> 1 contours are displayed in explore mode only. Decimal values between 0 and 1 are considered to be 0. The same is true for negative values. The GENERIC_MANMADE areas of different heights show up at different zoom levels in explore mode which suggests the model is aware of heights in a sense. Of all FID's of "Roads of Russia" 5.29 map only 1280 turned out to have extruded heights and on this map only footprints of 3D models are displayed in navigation mode. Checking all available FID's of the abovementioned map in the MPC_viewer confirmed the GENERIC_MANMADE has 0 elevation (that is, no elevation info at all, to be precise) in all builds except 1280 but for some reason having exactly the same parameters for object properties in a custom map does not make GENERIC_MANMADE areas be displayed the same way as in official maps. How strange...
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