Having upgraded our vessels from the Comset CM820-W (3G/4G) to the newer CM210 (dual sim card 3G/4G/4GX) variant coupled to dual 3G/4G/4GX outdoor marine grade antennas, the cellular data throughput of the CM210 is stable, reliable and very FAST! The dual sim option has given the vessels options when sailing into International waters also. I’ve tested the CM210 modems off Fremantle, Dampier, Singapore, Batam, Dubai and can say they simply work. Well done Comset for an outstanding upgrade to an already solid product.