Adjustable rowlock

1. An adjustable rowlock for changing the orientation of the blade of an oar, the rowlock comprising:

a body having a clamp and clamp adjusting means, the clamp including upper and lower sections which are pivotally connected at a first end and releasably connected at a second end;

a rotating bracket positioned within the upper and lower sections of the clamp;

an oar sleeve having a datum mark to be aligned with a plurality of reference marks arranged on the body so that a user may choose from a plurality of orientations of the blade corresponding to the reference marks, to suit the water conditions; and

a clip which is affixed to the rotating bracket and rotates adjacent to the clamp.

2. The rowlock of claim 1 wherein the rotating bracket has the reference marks arranged thereon.

3. The rowlock of claim 1 wherein the rotating bracket has one or more datum surfaces whose orientation relative to the clamp is adjustable using the clamp adjusting means.

4. The rowlock of claim 3 wherein the range of motion of the or each datum surface on the rotating bracket is restricted by one or more locking stops on the body of the rowlock.

5. The rowlock of claim 1 wherein the rotating bracket has ridges to secure the lateral position of the rotating bracket within the upper and lower sections of the clamp.

6. The rowlock of claim 1 wherein a bush is placed between the rotating bracket and the clamp to reduce friction when feathering the oar.

7. The rowlock of claim 1 wherein the body includes a spindle which is adapted to permit a vertical range of movement of the oar.

8. The rowlock of claim 7 wherein the body includes a rowlock pin housing adapted to connect to the spindle.

9. The rowlock of claim 8 wherein the rowlock pin housing is adapted to permit a horizontal range of movement of the oar.