This was the only compass i found that fit my Necky Kayak (Looksha-poly). Just cut a hole and it flush mounts in were the 4inch flat spot is on top of the deck and looks great. These are the same compasses that delta uses on there kayaks.
Pros: Looks great and is easy to see and use
This review was written in the old system and had content requirements that are different than reviews written today.