Overview

The Garmin 010-12390-42 is a trim piece snap cover for GPSMAP 8x22 glass-helm installs, used to finish off the opening around a GPSMAP 8422 or 8622 multifunction display.

It snaps into place to close up the visible trim gap and bring the helm back to a tidy, uniform look after an install, a refit, or a service pull. The trim piece measures 20.8 inches long by 0.5 inches wide, so it is worth matching the span to your 8x22 opening before ordering.

This is the bezel-style trim cover that sits around the mounting opening. It does not cover the display face like a protective sun cover, and it does not change anything about power, sonar, or networking.

Key features

• Compatible with Garmin GPSMAP 8422 and GPSMAP 8622 MFDs (GPSMAP 8x22 family)
• Snap-on trim piece used to clean up the edge and gap around a glass-helm mounted display
• Trim piece size: 20.8 in (L) x 0.5 in (W)
• No wiring or configuration; it is a mechanical finish piece installed after the unit is mounted

Compatibility and fit

Match this cover to the display model (GPSMAP 8422 or 8622) and the GPSMAP 8x22 mounting family. If your helm uses a different size series, the trim length will not line up the same way.

Installation and setup

With the chartplotter already seated in the helm, the cover snaps into the trim area to finish the perimeter. For removal during service, work slowly around the edge and use a plastic trim tool if needed to avoid marking acrylic, glass, or gelcoat.

Use on board

This part matters most on glass dashes where small gaps stand out and grime likes to collect along edges. It is a good fit for builders and refitters aiming for a flush-mount finish that looks tidy, and for owners replacing a missing trim piece after electronics work.