I want to learn how to be a good brain surgeon, but just give me a good bone saw and a scalpel - I don't want to bother learning the details - I just want to do brain surgery.....

...is an analogy of what you are saying. I doubt you will be happy with any high-performance electronics as you want units with an 0n-Off button. That doesn't happen at the high-end bleeding edge.

Many of them will give you a fairly nice image as-is, but to really get the most out of any high performance unit, tuning is necessary - if nothing else then due to the immense variation in environment.

All of your assumptions are incorrect, such as "I don't want to bother learning the details", "as you want units with On/Off buttons" are not even in the ball park of being correct. Not sure why you would feel the need to attempt to belittle someone in this community. Don't let the number of posts fool you sir. Just because I said the Demo shots looks awesome on the unit doesn't mean that's why I bought it. I called them demo shots for a reason, because I know there is a difference.

I vetted the Garmin against other like units and based on my budget, Garmin gets a shot. Don't care if you like Garmin or not. Compared to the data I get with a the graphs that came on the boat, everything indicates it will be an improvement, and I will be happy whether you approve or not.

Perhaps I am misreading your response, I have thought about since you posted it and I hope I am indeed reading to much into it. If your intent was to strike a chord with someone today, mission accomplished.

Good question. Im going to ask the Garmin folks..