Humminbird GM H12 Gimbal Bracket f/HELIX 12Humminbird GM H12 Gimbal Bracket f HELIX 12 GM H12 Gimbal Bracket for HELIX 12 Gimbal mount for HELIX 12 Series of fish finders. Features The GM H12 is a metal gimbal mount for HELIX 12 Series products. Includes the gimbal mount, knobs and mounting hardware. Compatible with: HELIX 12 MSI GPS G3N, HELIX 12 HW MSI GPS G2N, HELIX 12 CHIRP SI GPS G2N, HELIX 12 CHIRP SI GPS, HELIX 12 MDI GPS G3N, HELIX 12 CHIRP MDI GPS G2N, HELIX 12 CHIRP DI GPS G2N, HELIX