If you got to the "home page, then click on to Deck Plans, you can brig up a plan of each deck. On the plan, you will see a number "scale" running for and aft. These ar the main frames. You can use these as a sort of ruler. However, be careful - the frame spacing is 3' midship and redu es o ards the ends...i.e 2'06" the, 2 ". If you look at the bottome of the profile plan, you can get the excat measurements.