https://community.usms.org/swimming/f/general/12417/measuring-outdoor-poolI have used the gmap-pedometer app for years to measure running routes. It&#39;s good, but can be off after several miles if you don&#39;t track turns properly. Then I wondered how accurate it would be on a specific short distance. So I tried it on a town poolen-USTelligent Community 12https://community.usms.org/thread/198153?ContentTypeID=1Mon, 14 Mar 2016 12:34:27 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:ed77eccd-046b-41e7-bbd4-4924903ef020orca1946Did not know they allow lasers .<div style="clear:both;"></div>https://community.usms.org/thread/198098?ContentTypeID=1Sun, 13 Mar 2016 11:57:11 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:b0bbee31-5475-480a-9969-330125e700e8Bob.SingerI have used the gmap-pedometer app for years to measure running routes. It&#39;s good, but can be off after several miles if you don&#39;t track turns properly. Then I wondered how accurate it would be on a specific short distance. So I tried it on a town pool (Colonie NY) which states it is Olympic Size. I have always logged laps there in meters, but you never really know when they say that, whether it&#39;s yards or meters. Here&#39;s a link to the map which showed me exactly 50 meters. <a href="http://www.gmap-pedometer.com/?r=6818663">www.gmap-pedometer.com/</a> For competition, the pool must be measured with a surveyors tape or transit. Many facilities say they have Olympic size pools. I&#39;ve seen 20 yard hotel pools advertised as Olympic sized. The pool in Colonie looks like 50 m.<div style="clear:both;"></div>https://community.usms.org/thread/198137?ContentTypeID=1Sun, 13 Mar 2016 07:54:07 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:fb63efed-a9cc-4bc7-88d6-62f264209d1dsmontanaroThis method might still be useful when you wind up swimming at an unfamiliar pool. I just paced off the hotel pool in Puerto Vallarta, estimating it to be twenty meters. I might have made a better estimate with a pedometer app on my phone.<div style="clear:both;"></div>https://community.usms.org/thread/198121?ContentTypeID=1Sun, 13 Mar 2016 04:35:15 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:19ec23b4-d900-48c7-8e47-e645f243c91esunruhum no a laser can be used<div style="clear:both;"></div>https://community.usms.org/thread/198110?ContentTypeID=1Sun, 13 Mar 2016 04:06:46 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:056bd83a-f3a8-45f9-a393-710c2175177aBobBruceUSMS pool measurement details can be found at <a href="http://www.usms.org/admin/lmschb/gto_rectab_pool_measurement.pdf">www.usms.org/.../gto_rectab_pool_measurement.pdf</a>.<div style="clear:both;"></div>https://community.usms.org/thread/198102?ContentTypeID=1Sun, 13 Mar 2016 03:31:38 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:d5e63719-b40b-40cf-b3ff-0c5023571b9borca1946To be official a metal tape must be used.<div style="clear:both;"></div>