There are Furuno GT-8031's and GT-8037's listed on Ebay for cheap-ish. Tge 8031 is a small (around 1x1") module with an antenna pigtail with a H.FL connector on it. The 8037 looks like a Motoroa M12 board with a MMCX connector.

Hi, On Fri, Mar 09, 2018 at 05:23:54PM +0000, Mark Sims wrote: > There are Furuno GT-8031's and GT-8037's listed on Ebay for cheap-ish. > Tge 8031 is a small (around 1x1") module with an antenna pigtail > with a H.FL connector on it. The 8037 looks like a Motoroa M12 > board with a MMCX connector. Would these other modules be compatible with the controller and firmware in the GPS-4? I wasn't sure if they all used the same commands and responses. Mark -- Mark G. Thomas (Mark@Misty.com), KC3DRE