TVG Setting for DFF1

MarMax

Furuno Super Fan
So as not to hijack MikeR13's thread about TVG I'm asking the same question but as it relates to a DFF1. The TGV explanations are fantastic and I'd like to know how it works with the DFF1 since it does not have a menu choice for TVG depth, only LF/HF level. Does TVG only work in manual mode and is it based on the current range selected?
 
MarMax,
The DFF1 has a fix limit on it TVG range. Below is a screen shot from a similar sounder module. If I remember correctly it only effected the top 100-120ft of the water column.

Snips
 

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