I'm a historian working with a variety of World War II museums. Two of them, I think would have particular interest in your charts. The first is the D-Day Museum in New Orleans.
The second is aboard the only ship that was at Normandy that has survived to the present. It is the Jeremiah O'Brien, whose home port is San Francisco. You may remember, it sailed to Normandy in 1994 to commemorate the 50th anniversary of D-Day.
Both groups would be delighted to be offered your charts. Also, if the ship your uncle sailed on was built in the Kaiser yards in Richmond, CA, there is another museum being prepared aboard the Victory ship, Red Oak. The ship is currently being rennovated at Richmond, CA.
If any of this is of interestest to you, send me a Personal Message and I will give you as much detail as you would like.