A GPS is nice to have in the daytime but a really shines at night. It makes a cloudy, moonless night enjoyable instead of a white knuckle experience. Obviously you can live without it and you should be able to get home or at least somewhere safe if it breaks. But that applies to anything on your boat.
BTW "really shines" can be a problem with your night vision, make sure you learn how to dim the screen at night.
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