The 4.700 software is now available for some additional Humminbird units on the Humminbird web site. Here are listed all of the model units that now have the 4.700 software update available:
718
718
778c
788c , ci , and ci NVB models
798c Si, c NVB , ci , and ci NVB models
1157c
1197c Si
This software includes:
Support for LakeMaster chart cards.
Adds new SI sonar color palettes (for Si capable units only).
Adds new 2D sonar color palettes.
Improved GPS performance to provide higher chart update rates.
Sonar processing improved to increase trolling motor noise rejection.
New menu item for sound control.
It corrected problems with the depth offset algorithm, SD card reporting incorrect size, issue of GPS output becoming disabled in certain navigation modes, snapshot not functioning in POS mode, centering issue when changing chart orientation, problem of displayed track becoming offset from boat.
Greg Walters at Humminbird