Here is the simple oar system on my Navigator:
This is a curved aluminum plate with a post of solid aluminum about 1" diameter and 2" long. Sewn under a heavy piece of PVC coated cloth
In this picture you see the Aluminum tubes (about 6" long for clearance) mounted on the post with a clip. At the top is removeable oar holder that clamps to the oar itself. Easy set up.
thanks FG for the pics... the Navigator II looks great. can the whole craft be packed into a carry bag? looks like a pretty big craft from your pics...