SEARCHING FOR 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 53.SIG W122 44.NAL
S = sum of the km marker on 5th Ave between Pilot and Kerry Streets and the most easterly km marker
I = km marker nearest to the Railway & Forestry Museum
G = difference between the km marker near the the kiosk at the western end of 15th Ave and the km marker at the parking area for Moore's Meadow Park
N = km marker on 5th Ave between Ospika Blvd and Lyon St/Ahbau St
A = the most southern km marker subtracted from itself
L = difference between the km marker in the Hudson's Bay Wetland Nature Park and the km marker in Carrie Jane Gray Park