So with the new boat having an enclosed lower helm, I am pondering whether to get a full garmin unit downstairs or just grab one of our old laptops and set it up as a dedicated GPS for the lower helm. What's the best option out there these days? Some of the ones I have looked at in the past got around the fact that a laptop can't dim it's screen sometimes by having a "redlight" function that turned everything a soft red to preserve night vision.