I am currently running software version 6.740 on my 998 hdsi. I'm wondering if I should update to the newest version (7.670)? Is it even safe to make a jump from such a old software version to the latest? I only use the unit for side imaging, 2d and gps mapping and I have no intention to ever use 360 or Ipilot. I'm getting ready to purchase a lake master plus map card so that has me wondering if I should upgrade. Any suggestions would be great