I make it a habit now to inquire whether they want to see more content or bigger content. It's an ongoing thing as computer/technology savvy customers get older and eyesight suffers. And then when they get that, you find out that they really wanted a way to zoom in the content to make it bigger, not to show more content in a larger window. The reason I mention this is that I develop apps for computers and iPhones/iPads, and I often hear from customers that they want larger windows or the ability to resize windows to be bigger. You can always zoom in the maps to see the navigational details better, but when you have to zoom in so far that all you see is a single buoy, that starts to hurt the navigational aspect. I think you might want to go as large as you can to a certain extent and then stop there, since the next size up won't necessarily be better for eyesight/readability. Or at least do the math to compute the "dots per inch (dpi)" for each screen, knowing higher dpi will make things look smaller. You may really need to go visit a retail display where you can see all the units/sizes and compare them. If this is a readability/eyesight issue, bigger isn't necessarily better. You can of course zoom the maps to see better detail, but the interface graphics (buttons, touch targets, etc) stay the same. The larger units go through through these resolution jumps every couple sizes, with the bigger units showing more content on the screen, not bigger graphics. I have a 7608 unit which is an 8" screen and is the first size where you get higher resolution, so the user interface graphics are actually smaller than the 7" unit but you see more content on the screen. You can look at to get an idea of sizes and costs. Garmin makes a bunch of units that are only GPS chartplotters, though in the bigger screen sizes that usually only saves you a couple hundred bucks (or so) compared to the combo GPS/chartplotter/fishfinder that also has sonar capability.
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