This cache is not at the posted coordinates.
45°06'58.8"N 74°31'04.9"W parking lot
This is a simple number substitution, but to sole you need to find 3 signs in the marsh
N45 AB.CDE
W074 FG.HIJ
Starting in the parking lot, look at the map with sponsors.
A – The last digit of the North Glengarry phone number
B – The last digit of Macs marina phone number minus 1
C – The 7th digit Decostop phone number
D – The Highway number the marsh is on
E – The 8th digit in the South glengarry minus the 10th digit in the South glengarry phone number
Sign was updated so here is the mising phone numbers
North Glengarry 613-525-3030
South Glengarry 613-347-2929
Next stop is the Historic Notes Sign at the tee in the road
xFG – Number of bird spices – 3rd line from the bottom
Last stop is the wildlife track sign for tracks and match to a number on the left
H – Track B
I – Track J
J – Track f
Hint for the tracks, key is on the sign
see picture of missing sign

FTF goes to calmjam, bugbitten and Coneflowerblue. Congrats on the find,