RAM® Composite Drill-Down Mount for Garmin GPSMAP 73, 78, 78S, 78SC

Name: RAM® Composite Drill-Down Mount for Garmin GPSMAP 73, 78, 78S, 78SC
Brand: RAM Mounts
SKU: RAP-B-138-GA40
Price: 32.03 USD
Availability: InStock
Rating: 5.0 (5 reviews)

RAM® Composite Drill-Down Mount for Garmin GPSMAP 73, 78, 78S, 78SC - Main image

RAM® Composite Drill-Down Mount for Garmin GPSMAP 73, 78, 78S, 78SC - View 2

$32.03 ~~$44.49~~ In stock

Category: GPS Mounts

The RAP-B-138-GA40 consists of a 2.5" diameter round base with the universal AMPS hole pattern, double socket arm, diamond adapter base and high strength composite cradle. The mount is designed with a RAM 1" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles.

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Customer Reviews (5.0 / 5 · 5 reviews)

Riley ★★★★★ Oct 23, 2026

The AMPS hole pattern on the base made it easy to install on my boat's existing bracket. The double socket arm holds my GPSMAP 78SC firmly even when I hit a big wake. Feels solid and well-built for the price.

Elizabeth C. ★★★★★ Oct 22, 2026

That double socket arm clicked instantly onto my boat’s existing mount, and the composite cradle grips my 78s without any wobble even on rough water.

Matthew I. ★★★★★ Oct 21, 2026

The AMPS pattern on the 2.5" round base lined up perfectly with my old mount holes, making installation a breeze. The composite cradle feels sturdy enough for rough waters, and the diamond adapter base keeps my 78 locked in tight.