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{| style="border:2px solid lightgray; float:center; margin:10px;"|align="left" style="padding: 5px 10px 5px 10px"|[[Image:bulb2.png|25px|Represents a tip or {note for using IMSMA.]]|align="left" style="padding: 5px 10px 5px 10px"| Note that these procedures are done outside of IMSMA.|}}
Major modifications to the IMSMA maps must be performed in an external desktop GIS application such as ArcMap 9.x. To change existing maps: