The What NGS Triangulation Station BEAUTIFUL Survey marks or monuments are objects used to mark a precise location and/or elevation on the earth. The markers most survey mark hunters look for most often are 4-inch brass or aluminum disks installed into a stable setting like bedrock, an embedded boulder, a specially-poured concrete monument, a large building or bridge. Earlier survey monuments were…
Agencies Agencies that establish survey markers Adirondack Surveys Aquatrak Army Corps of Engineers AT&T AZDOT Boston Museum of Science Bureau of Land Management Central Railroad of New Jersey City of Hazleton Clark County Surveyor’s Office County of Carbon Defense Map Agency Delaware-Hudson Land Surveyors Association Delaware and Hudson Railroad Delaware Dept. of Highways and Transportation Erie…
Last updated August 16, 2026 For airway beacons in the western U.S., see: Airway Beacons List—Western U.S. The following is an incomplete list of airway beacons and arrows. The original list, compiled by Roger Barnes in 2003, was drawn from the NGS database of survey marks. In recent years, many other contributors have shared their knowledge and added other beacon and arrow sites to the list. Many…
Last updated August 16, 2026 For airway beacons in the eastern U.S., see: Airway Beacons List—Eastern U.S. The following is an incomplete list of airway beacons and arrows. The original list, compiled by Roger Barnes in 2003, was drawn from the NGS database of survey marks. In recent years, many other contributors have shared their knowledge and added other beacon and arrow sites to the list. Many…
Airway Beacons Why airway beacons? Light for the Night Air Mail Why airway beacons, on a site dedicated to survey marks? Apart from their obvious connection as objects that helped to build the current American infrastructure, airway beacons and survey marks are connected in another, more obscure way: through the National Geodetic Survey database. In 2003 a fellow geocacher/survey mark hunter,…
"32 JPN",Not Found,Unknown (Not Found),2026-08-16T09:03:00-04:00,/surveymarks/32-jpn/,-75.69892416,41.4936352,"" "TT 7 K RM",Not Found,Unknown (Not Found),2026-08-08T09:08:00-04:00,/reference-marks/tt-7-k-rm/,-75.810099,41.753923,"" "TT 7 K",Recovered,Good,2026-08-08T09:03:00-04:00,/surveymarks/tt-7-k/,-75.80743,41.754027,https://images.planetzhanna.com/2026/08/08/thumbnails/tt7kcsm.jpg "PennDOT…
Browse Survey Mark Recoveries Browse by Year of Recovery + 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 Browse by Location + Arizona California Colorado Connecticut Delaware Florida Maine Maryland Nevada New Hampshire New Jersey New York Pennsylvania Utah Virginia Browse by Marker Type + Airway Beacon…
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Maps of early aviation routes in the United States All maps were digitized and made available by the Library of Congress, and each link will take you to the appropriate map in their digital collection. I’ve created this index because their collection of airway maps does not contain individual metadata and is therefore difficult to search. Note: These maps are for historical research purposes only.…
Local Control Monument Databases
Manual of Geodetic Triangulation (excerpts) Title Page Standard Marks of the U.S. Coast & Geodetic Survey Objects Used as Landmarks Standard Numbered Notes for Description of Marks Specifications For Marks Chapter 6.-APPENDIX Title Page Manual of Geodetic Triangulation Standard Marks of the U.S. Coast & Geodetic Survey Standard marks of the U.S. Coast & Geodetic Survey Objects Used as Landmarks…
Marker Types Airway Beacon Azimuth Mark Disk Bench Mark Disk Boundary Monument Cadastral Survey Disk Chiseled Cross Chiseled Square Chiseled T Control Point Copper Bolt CORS Station Downtown Restoration Program Disk Drill Hole Drill Hole with Lead Earthquake Research Disk Electronic Traverse Station Disk Elevation Mark Forest Health Inventory and Monitoring Disk Gaging Station Disk Geodetic…
The following 457 survey marks have been reported to NGS; updates have been added to the NGS database . WISCASSET BROWN SPIRE • September 4, 2025 WISCASSET CONG WHITE SPIRE • September 4, 2025 X 248 • October 7, 2024 B 46 • October 7, 2024 IRVING AZ MK • October 7, 2024 RV 128 • October 7, 2024 HUBER RM 2 • October 7, 2024 HUBER • October 7, 2024 B 249 • October 7, 2024 RV 129 RDGRR • October 7,…
NGS Historical Geodetic Control Diagrams Geodetic Control Diagrams Alabama Andalusia, Alabama (NH 16-2).pdf Birmingham, Alabama (NI 16-8).pdf Dothan, Alabama_Georgia_Florida (NH 16-3).pdf Gadsen, Alabama_TN (NI 16-5).pdf Mobile, Alabama- Mississippi_Louisiana (NH 16-4).pdf Montgomery, Alabama (NI 16-11).pdf Phenix City, Alabama_Georgia (NI 16-12).pdf Alaska Anchorage, Alaska U.S. , Yukon, Can.pdf…
PID Prefix Map This map shows the general scheme used when assigning the first two (alphabetic) characters of NGS survey mark PIDs. Note that occasionally, for a number of reasons, a mark may have a PID that falls outside of this general pattern.
All Posts 2025 July 14 More Wyoming USGS Datasheets Posted! USGS datasheets July 3 Chocolate Benchmarks are Back! publicity May 28 Nebraska USGS Datasheets Available USGS datasheets March 20 Missouri USGS Datasheets Posted USGS datasheets March 2 Washington, DC Historical Benchmark Tour featuring Dave Doyle datasheets NGS tour February 25 Florida USGS Datasheets Posted USGS datasheets January 20…
Map of Recoveries
Resurvey of the Heart of the Grand Canyon Narrative Technical Notes on the Survey Program Photogrammetric Notes Work Schedule Growth of the Grand Canyon Map Lockwood Mapping Sheet Completions National Geographic Grants to Grand Canyon Projects Grand Canyon Survey 1971 – 75 Station Types Grand Canyon Survey Data Laser Observation Data View Original Report 1971-1978 National Geographic Society –…
Sources of survey data This list contains both professional data and information for recreational hunters, so please note the source of each and evaluate accordingly. Also note that some sources, USGS datasheets in particular, contain many superseded marks that are no longer reliable for survey purposes but are very useful for recreational survey mark hunting. Professional resources NGS Database:…
NGS Triangulation Station BEAUTIFUL Survey marks or monuments are objects used to mark a precise location and/or elevation on the earth. Survey mark hunting, sometimes referred to as “benchmark hunting” regardless of the type of marker being sought, is simply the activity of searching for these survey marks. When we find, or “recover,” a mark, we do not take it or disturb it in any way. We…
Posts by Tag airway beacons October 31, 2022 Articles about Airway Beacons and Arrows airway beacons publicity October 3, 2020 Portland—Spokane Beacon #12 in Arlington, Oregon airway beacons June 27, 2020 Beacon Site Southwest of Las Vegas, Nevada airway beacons February 17, 2019 Salt Lake—Omaha Beacon Sites #38 and #42 airway beacons October 11, 2018 Arrow at Great Salt Lake, UT airway beacons…
The following 27 survey marks have been reported to USGS; updates have been added to USGS datasheets. 37 B • August 2, 2005 DLW 1889 • July 18, 2005 15 C • July 18, 2005 25 HLZ • July 18, 2005 212 LRP • July 2, 2005 K 24 • June 11, 2005 ET 5 CRH • May 30, 2005 TT 2 H • May 29, 2005 39 JPN • May 22, 2005 TT 1 H • April 13, 2005 29 JPN • April 5, 2005 PTS 1 Y • February 7, 2005 1102.46 • December…
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