The 943/1243 chart plotters are great units at a great price. The 86xx chart plotters are best-in-class units but are more expensive. I replaced my
943xsv with a 8610xsv mainly because I got a new old stock deal on the 8610 ($1,000). Garmin doesn't allow distributors to discount the units so you will see them everywhere at the same price. Only way I have found to get a "discount" is West Marine rewards program. Several times throughout the year they have a 5X points weekend. That amounts to a 20% discount coming back as West Certificates. Previously I bought 8612 and GMR18 Fathom - great deal on items that are not discounted online.
Screen resolution mostly affects what you can see at a given scale on your maps. Noticeable when you are running when you need to see bottom detail but also need to see the big picture to see where you are headed. You could run two chartplotters - one zoomed in and one zoomed out.
The 943/1243 displays are 1,280x720. The 86xx series of displays are generally 1,920x1,080 with a few models that are slightly different. Both series of displays offer larger screen sizes but the resolution remains the same.
4210 800 x 600 = 480,000 pixels.
943 1,280 x 720 = 921,000 pixels. This unit has 92% more pixels than the 4210.
1243 1,280 x 720 = 921,000 pixels. This unit has 92% more pixels than the 4210.
8610 1,920 x 1,200 = 2,304,000. This unit has 150% more pixels than the 943/1243.
8612 1,920 x 1,080 = 2,073,600. This unit has 125% more pixels than the 943 and 11% less than the 8610.
Baltimore canyon 3nm scale.
It you zoom out one click to 5 nm scale you cross the line where detail is dropped to display a larger area.
Go back the other way and zoom in to 0.5nm scale.
As you can see your field of view is substantially different between the units for a given scale. For chart plotting resolution matters. No so much with radar and sonar - but I haven't compared - to hard to do side-by-side comparison.
You get the same data from either unit but its harder to see what is around you or up the beach.
So as not to confuse anyone the 8610 had my NJ waypoint set loaded. The 943 did not. Does't affect the results.