Looks like they posted a new software version for the Echomap Plus and Ultra units.
Dont look like a whole lot:
Changes made from version 8.30 to 9.20:
Add support for Garmin Trolling Motor.
Add control for displaying Federal Mineral Lease Block chart layer.
Add ability to store Hull Identification Number (HIN).
Add sonar magnify controls.
Made various improvements to map drawing.
Fix issue where a unit would power on randomly when connected to another unit. Power modes now sync between units.
Fix issue where depth range shading did not conform to contour lines.
https://www8.garmin.com/support/note.jsp?id=4749