Best GPS speedometers?

[readyfireaim]

Hello OSE,

I just got my first boat, a BJ29, on a lark and realized that it is awesome! Long story short, I'm hooked.

I'm looking to pick up a used speedometer, but I'm not sure which is my best bang for my buck. I see the Garmin Forerunner 201 a lot in guys pics. Any reason in particular? Is any Garmin as good as another?

Thank you,

[Spartanator]

Garmin Forerunner 201! It's cheap, easy, and it works!