The posted coordinates take you to a spot where an old palindrome is visible. Call the palindrome "abcd". When you find it, use it to give you what's needed for the final coordinates, where:
(a+b+c+d)- 10 = number of decimal minutes added to the last three numbers of the posted latitude for final coordinate
((a+b)x(c+d))-33 = number of decimal minutes subtracted from the last three numbers of the posted longitude for final coordinate
The camoflauged waterproof match container holds a Cache note, log sheet. You'll have to bring your own pencil. It's important to leave the container just as you found it!
For more on geocaching in Iowa, visit the Iowa Geocachers Organization home page.