Another gross exaggeration to try and support an unsupportable
premise.
I HAVE a chartplotter and a radar on my sailboat. There is no setting
I could use on them that would come even remotely close to drawing 20
to 30 amps.
See my post Salty, he means amp-hours,,, it's like if I asked you what
kind of gas milage you got on the highway and you said "Oh about 23
gallons".