Sea-Dog Quarter-Turn Textured Deck Plate w/Internal Collar - White - 5" [336352-1] Brand_Orion you can use the camera

you can use the camera on the iPhone/iPad to scan the horizon

designed to use 1lb

Adjust the Sensitivity:

∗ Sold as a Single

45 Degree Lubber lines

Sea-Dog Quarter-Turn Textured Deck Plate w/Internal Collar - White - 5" [336352-1] Brand_Orion you can use the cameraQuarter Turn Textured Deck Plate with Internal Collar White 5" The Sea Dog Quarter Turn Deck Plate is constructed of UV stabilized ABS. Features a new locking system that prevents over tightening, jamming, and cross threading. These deck plates also feature an internal, molded in collar on the bottom to hold deck plate bags or other round containers. When installing, use silicone sealant on hull or deck surface. Keep threads clean with hot, soapy