Has anyone installed a 12" Garmin - GPSMAP 1242xsv in a 228?

[Hookup1]

You made the right decision going with the 8610xsv's. It's a better unit if it's within your budget. I chose them for my boat.

Interesting thing is the Garmin chartplotter series of displays have nearly identical screen resolution. There is not much difference between the 943xsv and the 1243xsv.

The jump to the 86xx series is significant. This unit has 150% more pixels than the 943/1243. Makes a big difference on charts, no so much on radar or sounder. The 8612 actual has less pixels (lines).

943xsv $1,399.99
physical 9.2" x 6.4" x 3" (23.3 x 16.2 x 7.6 cm). 5 1/2" cutout height
screen 7.8" x 4.4"; 9.0" diagonal
WXGA; 1280 x 720

8610xsv $2,699.99.
physical 10.25" x 8.0625" x 2.95" (25.9 cm x 20.5 cm x 7.5 cm). 6 15/16" cutout height
screen 8.6" x 5.4"; 10.1" diagonal
WUXGA; 1920 x 1200 pixels. <<< Best resolution

1243xsv is $2,899.99
physical 12.1” x 8.9” x 3.2” (30.8 x 22.8 x 8.2 cm). 7 15/16" cutout height
screen. 10.3" x 6.4"; 12.1" diagonal
WXGA; 1280 x 800 pixels

8612xsv $3,999.99
physical 11.9" x 8.5" x 3" (30.3 cm x 21.6 cm x 7.6 cm) 7 3/8" cutout height
10.1" x 5.7"; 11.6" diagonal
FHD; 1920 x 1080 pixels