My buddy has that 176C in a Shamrock 20 Pilothouse. Since its mounted about 15" from his nose, he has no problems with the little screen.
What he has a BIG problem with is this unit's unfortunate propensity to screen wash-out in sunlight. Even his completely enclosed pilothouse is insufficient to shade that screen.
Interesting, as the Garmin color plotters, like the 182C and 2006C do not suffer from this problem. They must have a different screen technology.
Before you buy that 176C, make sure:
A/ you can comfortably see the screen from whatever distance fromthe helm you are mounting it and
B/ make sure you can see the unit during the daylight hours under the day-light conditions that actually exist in your boat.
They all look nice under the fluorescents at West Marine.
Just a heads-up.