Interesting, I'm surprised I haven't heard of that before. I was getting "invalid map object data" even after doing save compressed. Using Epic GTA2 Map Editor > tools > optimise GMP, removed that error but it also removes the orange cones from one of the bridges. Cones are the only objects on the map that were added using the editor rather than the much more stable script method.http://gtamp.com/images/cones.jpg
Coordinates for the 10 cones. I'd add them again using script but the decompiler isn't complete enough and no one has made an SCR editor that allows inserting commands.
OBJ_DATA cone01 = ( 50.00 , 162.480 ) 0 CONE
OBJ_DATA cone02 = ( 50.64 , 162.480 ) 0 CONE
OBJ_DATA cone03 = ( 51.96 , 162.480 ) 0 CONE
OBJ_DATA cone04 = ( 51.00 , 162.460 ) 0 CONE
OBJ_DATA cone05 = ( 51.50 , 162.460 ) 0 CONE
OBJ_DATA cone06 = ( 52.60 , 162.500 ) 0 CONE
OBJ_DATA cone07 = ( 50.48 , 145.104 ) 0 CONE
OBJ_DATA cone08 = ( 50.00 , 145.104 ) 0 CONE
OBJ_DATA cone09 = ( 52.00 , 145.104 ) 0 CONE
OBJ_DATA cone10 = ( 51.60 , 145.104 ) 0 CONE
Those coordinates don't seem to be 100% accurate, the part after the decimal point shows as an X or Y offset in the map editor and I wasn't sure how to convert that.