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| Location (reference stations) |
Coordinates |
| Aberdeen, Washington | 46.9667° N, 123.8533° W |
| Aberdeen, Washington (2) (expired 1993-12-31) | 46.9667° N, 123.8533° W |
| Aberdeen, Washington (3) | 46.9670° N, 123.8500° W |
| Anacortes, Guemes Channel, Washington | 48.5167° N, 122.6167° W |
| Bangor, Washington | 47.7483° N, 122.7267° W |
| Becher Bay, Washington | 48.0333° N, 123.6333° W |
| Bellingham, Washington | 48.7500° N, 122.5000° W |
| Bellingham, Washington (2) | 48.7500° N, 122.0500° W |
| Blaine, Semiahmoo Bay, Washington | 49.0000° N, 122.7667° W |
| Blaine, Semiahmoo Bay, Washington (2) | 49.0000° N, 122.7667° W |
| Bremerton, Washington | 47.5667° N, 122.6333° W |
| Cape Alava, Washington | 48.1667° N, 124.7333° W |
| Cape Alava, Washington (2) | 48.1667° N, 124.7333° W |
| Charles Island, Washington | 48.4500° N, 122.9000° W |
| Cherry Point, Washington | 48.8633° N, 122.7583° W |
| Cornet Bay, Deception Pass, Washington | 48.3833° N, 122.6333° W |
| Crescent Bay, Washington | 48.1667° N, 123.7333° W |
| Crescent Bay, Washington (2) | 48.0167° N, 123.7167° W |
| Everett, Washington | 47.9833° N, 122.2167° W |
| Ferndale, Strait of Georgia, Washington | 48.8333° N, 122.7167° W |
| Friday Harbor, San Juan Channel, Washington | 48.5500° N, 123.0000° W |
| Friday Harbor, San Juan Channel, Washington (2) | 48.5500° N, 123.0000° W |
| Friday Harbor, San Juan Island, Washington | 48.5467° N, 123.0100° W |
| Halls Boathouse, Washington | 48.0500° N, 123.5500° W |
| Meadowdale, Washington | 47.8500° N, 122.0333° W |
| Nahcotta, Willipa Bay, Washington | 46.5000° N, 124.0233° W |
| Neah Bay, Washington | 48.3683° N, 124.6167° W |
| Neah Bay, Washington (2) | 48.3667° N, 124.6167° W |
| Neah Bay, Washington (3) | 48.3667° N, 124.6167° W |
| Olympia, Washington | 47.0500° N, 122.9000° W |
| Patos Island, Washington | 48.7833° N, 122.9667° W |
| Port Angeles, Washington | 48.1167° N, 123.4333° W |
| Port Angeles, Washington (2) | 48.1167° N, 123.4333° W |
| Port Townsend, Washington | 48.1117° N, 122.7583° W |
| Port Townsend, Washington (2) (expired 1991-12-31) | 48.1117° N, 122.7583° W |
| Port Townsend, Washington (3) | 48.1333° N, 122.7667° W |
| President Channel, Orcas Island, Washington | 48.6550° N, 123.0083° W |
| Raymond, Washington | 46.6833° N, 123.7500° W |
| Reservation Bay, Washington | 48.4167° N, 122.6667° W |
| Reservation Bay, Washington (2) | 48.4167° N, 122.0667° W |
| Seattle, Washington | 47.6050° N, 122.3383° W |
| Seattle, Washington (2) | 47.6000° N, 122.0333° W |
| Sekiu, Washington | 48.2667° N, 124.3000° W |
| South Bend, Washington | 46.6633° N, 123.7983° W |
| Tacoma, Washington | 47.2833° N, 122.4167° W |
| Toke Point, Willapa Bay, Washington | 46.7083° N, 123.9650° W |
| Toke Point, Willapa Bay, Washington (2) | 46.7067° N, 123.9650° W |
| Vancouver, Columbia River, Washington (dubious accuracy) | 45.6267° N, 122.6833° W |
| William Head, Washington | 48.0333° N, 123.5333° W |
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