[mkgmap-dev] Is anyone creating a Database of Linetypes and Points that will not show up on specific Garmin GPS's?

My GPSMAP 276c will not display LINETYPE: 0x20 My Montana 600 will not show display the following POINTS: 0x3001,0x3002,0x3008,0x5904 POINTS This info can be helpful if you cannot see data on your GPS and your CODE is correct. Greg