i did so on the last boat using a Cetrek cockpit repeater.
The only problem was that if you told the boat to "goto" the cursor position it gave cog & sog on the repeater. If you told it to "goto" a saved waypoint then the sog & cog were missing on the repeater screen. Even navman in New Zealand never sorted that one out.
Had I kept that boat I might have interposed the units as when sailing single handed there were many occasions when a plotter chart would have been most useful in the cockpit and position cdts would have been sufficient at the chart table for hourly plotting purposes.