As DDW said they have very similar optics to the Polaris model, but weigh MUCH less. I have a pair of Mariners for 6-7 years and they are great. I have the compass but seldom use it.

As far as the range finder reticle goes, you won't use it. You have a power boat and will have your radar on all the time you are under way. Radar gives much more accurate ranges even if all you do is use the range rings.