SOS - The Park Bench Mystery Cache

==========================
A State Park Vehicle Permit is required.
==========================

The cache container is a medium Lock & Lock.

To find the cache, go to the posted coordinates. Once there look for the..."In Memory Of"...sign.
When you find it....you will need it to solve the following puzzle.

N42 48.ABC W083 31.DEF

A = The number of "M's"......B = The number of "D's"......C = The number of "F's"

D = The number of "T's".......E = The number of "E's"......F = The number of "N's"

This puzzle should be an easy one or maybe not.
Please hide the cache back as found.