Perko 1-1/2" Thru-Hull Fitting f/Hose Plastic MADE IN THE USA [0328DP8] Marine Navigation & Instruments | Instruments which gives you the capability

which gives you the capability to use the displays both on your boat and on the ice

The flat section can also be bolted to a flat surface

GPS 4-Ways:

Frequency: VHF Marine Band Bandwidth: 7 MHz SWR: 1

Perko 1-1/2" Thru-Hull Fitting f/Hose Plastic MADE IN THE USA [0328DP8] Marine Navigation & Instruments | Instruments which gives you the capabilityPerko 1 1 2" Thru Hull Fitting for Hose Plastic Molded White Plastic Broad Flange Technical Information: Hose Size Inches: 1 1 2 Mounting Hole Diameter Inches: 1 7 8 Maximum Hull Thickness Inches: 1 7 8 O. D. Flange Inches: 3 MADE IN THE USA Specifications: Hose Size: 1 1 2" Material: Plastic Box Dimensions: 2"H x 2"W x 6"L WT: 0. 3 lbs UPC: 085226768705