Purely depends on what file format the Hema stuff is in and what the polaris wants to use. There are so many different map formats. There is conversion software around - some is free, some isn't and typically no software handles every chart type. Do you have a micro sd adaptor for your computer? I would do a few google searches to see if you can find out the formats first and then if you can't, read the sd card and have a look for yourself.