18x is pretty much just a serial
data bus, similar to the RS-232 bus that computers
used to have over ten years ago. Still works just fine, but it is thoroughly obsolete in the computer industry.
You might find a NMEA
18x to wifi
"bridge", which takes the NMEA data stream and broadcasts it as a WiFi signal. But really, NMEA 18x is so easy to wire...all you need is a decent quality 3-conductor wire, and then a serial
port (or these days, a serial-to-usb adapter) on the laptop
One reason that RS-232 and NMEA 18x have been obsoleted, is that you will then still have to manually set and match the speed, parity, and bit depth
on the devices using the NMEA/serial data.
So if you can find an NMEA-to-WiFi bridge, go for it. Otherwise, it might be time to look at updating.