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I think this is the harder way to do it.
The easier way is to take a power brick with the power rating for your unit and solder that to a plug that fits your unit (which you already have). And you most likely already have the power brick laying around somewhere in the form of a power cable that you don’t need anymore (like for an xBox or something with a brick inline in the power cord). Cut off the existing power plug and solder the desired one on and insulate.
If you don’t have a soldering iron then crimp the wires together with a butt connector.
I’ve used these off Amazon and gotten female quick connects to solder the GPS power plug to. This way I can run the same brick for multiple GPS units, which sometimes I need to do (not simultaneously, obviously).
