# and after that you can use ./mmc command, you have to read forums depending on your nav system.
# and after that you can use ./mmc command, you have to read forums depending on your nav system.
```
```
# Updating the maps on RNS315 (THIS GUIDE IS FOR RNS315 ONLY, IF YOU DON'T HAVE THIS NAVIGATION, YOU MIGHT END BREAKING YOUR SD CARD, IF YOU HAVE OTHER SYSTEM, SUCH AS RNS310 READ OTHER FORUMS)
Steps:
Extract the content and copy on the SD, top folder is navpsf_update
Look under /dev to see which SD is yours, in my case it is mmcblk0