https://www.gadgetpool.eu/product_info.php?products_id=93&PHPSESSID=lj539jcm8qfo2hug1d5u7js77q
NMEA Multiplexer with bidirectional SeaTalk port and USB, gadgetpool
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https://digitalyachtamerica.com/product-tag/nmea-multiplexer/?orderby=date
NMEA multiplexer - Digital Yacht America
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https://dlcmarine.co.uk/product/actisense-ndc-4-usb-nmea-0183-multiplexer/
Actisense NDC-4-USB NMEA 0183 Multiplexer - DLC Marine Services
Jan 19, 2022 - Combine multiple sources of NMEA 0183 data into a single stream. Flexible and powerful enough to be the heart of a simple system, or one of many Actisense...
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