CAN YOU FIND SIGNAL?

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This is a two stage multi-cache, it is NOT at the posted coordinates!
Stage 1: At the posted coordinates you will find a sign with a map. Use the map to find the information necessary to answer the following clues for Stage 2.
Stage 2: Find SIGNAL at N53 55.SIG W122 43.NAL
S = km marker indicating the beginning of the Centennial Trail
I = difference between the most southerly km marker and the km marker located on Foothills between 5th Ave and Pilot St
G = sum of the most easterly km marker and the km marker located at the Cameron St bridge
N = difference between the km marker located at Carrie Jane Gray Park and the km marker located closest to the parking area at Ginters Meadow
A = number of the km marker located on 5th Ave between Ospika Blvd and Lyon St
L = difference between the km marker located west of Queensway St in the Hudson’s Bay Wetland Nature Park and the km marker located at the west end of Range Rd