{"page":"\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-572d6a42.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-f4d0de30.css\" media=\"all\" /\u003e\n\u003cdiv data-title='Exploring San Francisco on a GPS treasure hunt' data-url='/boclips/videos/5c54bcead8eafeecae1302ff' data-video-url='/boclips/videos/5c54bcead8eafeecae1302ff' id='bo_player_modal'\u003e\n\u003cdiv class='boclips-resource-page modal-dialog panel-container'\u003e\n\u003cdiv class='react-notifications-root'\u003e\u003c/div\u003e\n\u003cdiv class='rp-header'\u003e\n\u003cdiv class='rp-type'\u003e\n\u003ci aria-hidden='true' class='fai fa-regular fa-circle-play'\u003e\u003c/i\u003e\nVideo\n\u003c/div\u003e\n\u003ch1 class='rp-title' id='video-title'\u003e\nExploring San Francisco on a GPS treasure hunt\n\u003c/h1\u003e\n\u003cdiv class='rp-actions'\u003e\n\u003cdiv class='mr-1'\u003e\n\u003ca class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"\u003e\u003cspan\u003e\u003cspan\u003eGet Free Access\u003c/span\u003e\u003cspan class=\"\"\u003e for 10 Days\u003c/span\u003e\u003cspan\u003e!\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-body'\u003e\n\u003cdiv class='rp-info'\u003e\n\u003cdiv aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'\u003e\u0026times;\u003c/div\u003e\n\u003ci aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003ci aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003cdiv class='rp-rating'\u003e\n\u003cspan class='resource-pool'\u003e\n\u003cspan class='pool-label'\u003ePublisher:\u003c/span\u003e\n\u003cspan class='pool-name'\u003e\n\u003cspan class='text'\u003e\u003ca data-publisher-id=\"30356011\" href=\"/search?publisher_ids%5B%5D=30356011\"\u003eCurated Video\u003c/a\u003e\u003c/span\u003e\n\u003c/span\u003e\n\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-description'\u003e\n\u003cspan class='short-description'\u003eSan Francisco, California - 15 July 20101. Wide of San Francisco hillsSan Francisco, California - 30 January 20102. Wide of Golden Gate BridgeSan Francisco, California - 5 August 20103. Various of city trams4. City shoreline5. Port of...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eSan Francisco, California - 15 July 2010\u003cbr/\u003e1. Wide of San Francisco hills\u003cbr/\u003eSan Francisco, California - 30 January 2010\u003cbr/\u003e2. Wide of Golden Gate Bridge\u003cbr/\u003eSan Francisco, California - 5 August 2010\u003cbr/\u003e3. Various of city trams\u003cbr/\u003e4. City shoreline\u003cbr/\u003e5. Port of San Francisco sign\u003cbr/\u003e6. Wide of Larry Ryan and his son Sean, GPS users, having breakfast with friends\u003cbr/\u003e7. Various of Larry and Sean Ryan looking through 'geocache' information\u003cbr/\u003e8. Larry Ryan holding military tag\u003cbr/\u003e9. Close of tag\u003cbr/\u003e10. Group walks past tour bus\u003cbr/\u003eSan Francisco, California - 26 May 2010\u003cbr/\u003e11. Setup shot of Rick Wong, Website Administrator for Bay Area Geocachers\u003cbr/\u003e12. SOUNDBITE (English) Rick Wong, Website Administrator for Bay Area Geocachers:\u003cbr/\u003e\"Your GPS receiver receives signals from at least four of these satellites that are over the sky. The satellites are arranged so that you should be able to see at least four of them no matter where you are on the planet. And by synchronising the time delay that it takes the signal to get to your device, your device can figure out where it is, based on the positions of all those satellites.\"\u003cbr/\u003e13. Close shot of GPS device\u003cbr/\u003e14. Pan of skyscrapers\u003cbr/\u003e15. SOUNDBITE (English) Rick Wong, Website Administrator for Bay Area Geocachers:\u003cbr/\u003e\"The signal can bounce off these very tall buildings and so getting an accurate reading for your GPS if you're going to mark a waypoint usually means you want to take a bunch of readings to get it right.\"\u003cbr/\u003eSan Francisco, California - 21 June 2010\u003cbr/\u003e16. Wide of Larry and Sean Ryan walking\u003cbr/\u003e17. Close shot of GPS device UPSOUND (English) Larry Ryan:\u003cbr/\u003e\"It'll tell me now that we're that close to the cache - it says 39 feet, but it jumps around a little bit here.\"\u003cbr/\u003e18. Waterfall sculpture\u003cbr/\u003e19. Low angle shot as the Ryans walk up steps to the top of the waterfall sculpture\u003cbr/\u003e20. Mid shot of Larry Ryan finding a cache\u003cbr/\u003e21. Various of Sean Ryan signing the cache\u003cbr/\u003e22. Top shot of Larry Ryan putting the cache back in place\u003cbr/\u003e23. SOUNDBITE (English) Larry Ryan:\u003cbr/\u003e\"It's good for you, you're out walking around. And it adds a little bit of fun to searching and you know like Sean said you get to see a lot of great parts of the city, and it's fantastic.\"\u003cbr/\u003eSean Ryan:\u003cbr/\u003e\"Yeah instead of just going on a walk it actually like brings a purpose to a walk sometimes, or a purpose to a hike through the woods, or something like that.\"\u003cbr/\u003eLarry Ryan:\u003cbr/\u003e\"It's a lot of fun.\"\u003cbr/\u003e24. Wide of the Ryans walking\u003cbr/\u003e25. SOUNDBITE (English) Larry Ryan:\u003cbr/\u003e\"As Sean said it takes you to places that you maybe wouldn't normally go to. And there's probably a level of detail like certain sculptures and little odd things about the city that you see that aren't on any real tourist map. So it's a lot of fun to just walk the city.\"\u003cbr/\u003e26. Mid shot of the Ryans looking at hint on GPS device, walking toward new cache UPSOUND (English):\u003cbr/\u003eLarry Ryan: \"The hint is exchanging hands, micro.\"\u003cbr/\u003eSean Ryan: \"What's the name of the cache?\"\u003cbr/\u003eLarry Ryan: \"One to wall.\"\u003cbr/\u003e27. Wide of Ryans searching for cache\u003cbr/\u003e28. Larry Ryan finds cache and dislodges it\u003cbr/\u003e29. Close of open cache UPSOUND (English) Larry Ryan:\u003cbr/\u003e\"And then here's the log that we'll sign.\"\u003cbr/\u003e30. Sean Ryan signs log\u003cbr/\u003e31. Larry Ryan puts in Ryan family's tag and closes the cache UPSOUND (English) Larry Ryan:\u003cbr/\u003e\"We're going to put our path tag in the cache so someone else can find it and take it and then Sean will put the log back in, we'll put that back. And then it's all put back together and then Sean is going to put it back in its spot.\"\u003cbr/\u003e32. Mid shot of Sean Ryan putting the cache back under sculpture\u003cbr/\u003e33. Pan right of the Ryans walking toward pier by the Bay Bridge\u003cbr/\u003eA new hobby has got people around the world poking under benches, crawling around sculptures and ambling through the streets with GPS devices, in search of tiny electronic boxes.\u003cbr/\u003eFor those who want to avoid the tour bus, \"geocaching\" is the perfect way to discover a new city.\u003cbr/\u003eSan Francisco is one of the world's must-see cities for travellers, but there are many approaches to discovering its charm. \u003cbr/\u003eWhile most ride the cable cars and enjoy the city's hills and waterfront, others prefer to seek out special spots chosen by locals and typically overlooked by tourists.\u003cbr/\u003eGeocaching is a worldwide treasure hunt in which participants search for hidden markers or containers full of tiny objects that others have left behind. \u003cbr/\u003eUsing GPS devices, geocachers locate the caches using latitude and longitude, recording their findings at the cache and online.\u003cbr/\u003eThis hobby was made possible by the global positioning system or GPS, which was developed by the US department of Defence. \u003cbr/\u003eRick Wong, the Website Administrator for Geocaches in the Bay Area of California, explains how the system works.\u003cbr/\u003e\"Your GPS receiver receives signals from at least four of these satellites that are over the sky. The satellites are arranged so that you should be able to see at least four of them no matter where you are on the planet. And by synchronising the time delay that it takes the signal to get to your device, your device can figure out where it is, based on the positions of all those satellites,\" he says.\u003cbr/\u003ePrior to 2000 the signals were scrambled so that civilian readings were limited to an accuracy of about 100 metres, according to gpsgames.org. \u003cbr/\u003eBut when former president Clinton announced the end of the scrambling of GPS signals, the game was on. \u003cbr/\u003eThe first cache was hidden in Portland in the state of Oregon, quickly followed by others in Kansas, Illinois and California.\u003cbr/\u003eHowever there are still problems using the GPS system among the towering skyscrapers of San Francisco.\u003cbr/\u003eRick Wong says that making repeated readings can help to fix the problem.\u003cbr/\u003e\"The signal can bounce off these very tall buildings and so getting an accurate reading for your GPS if you're going to mark a waypoint usually means you want to take a bunch of readings to get it right,\" he says.\u003cbr/\u003eThe hunt has truly become global since its origins in the US Pacific Northwest a decade ago - there are now more than one (m) million active caches all over the planet, with 4-5 (m) million people participating worldwide. \u003cbr/\u003eIn the last month alone, people have logged more than four (m) million new finds, according to geocaching.com.\u003cbr/\u003eFather and son team Larry and Sean Ryan look for caches whenever they get a chance. \u003cbr/\u003eVisiting from Cadie, Texas, the Ryans took advantage of the chance to get to know some out-of-the-way spots while touring San Francisco with friends.\u003cbr/\u003eFor this virtual cache in downtown San Francisco, searchers have to find two plaques and email the dedication dates on each of them.\u003cbr/\u003eThe way to find a cache in an urban area is to find the street location and then zero in using more accurate GPS readings with a compass at the site, he says.\u003cbr/\u003eAs the Ryans explore San Francisco's embarcadero area, they head for unique sites chosen by locals rather than the typical tourist itinerary.\u003cbr/\u003eAs they get closer to the cache, the GPS device tells them how far they are from it.\u003cbr/\u003eThey often do geocaching while on hikes, but the urban search can be more complex.\u003cbr/\u003eThis cache, considered high in difficulty, is maintained by an avid local geocacher.\u003cbr/\u003eThey know this one is a magnetic cache, so they search underneath the metal railings of this fountain near San Francisco's Embarcadero waterfront.\u003cbr/\u003eOnce they've located it they write their geocaching name, FamilieRyan.\u003cbr/\u003eThen they put the tiny magnetic strip right back where they found it.\u003cbr/\u003eThen it's time to continue exploring the city.\u003cbr/\u003eThere are plenty of benefits to the practice, says Larry Ryan.\u003cbr/\u003e\"It's good for you, you're out walking around. And it adds a little bit of fun to searching and you know like Sean said you get to see a lot of great parts of the city, and it's fantastic,\" he says.\u003cbr/\u003e\"Yeah instead of just going on a walk it actually like brings a purpose to a walk sometimes, or a purpose to a hike through the woods, or something like that,\" adds Larry's son Sean.\u003cbr/\u003eMany of the spots in which the geocaches are hidden are seldom found on tourist maps.\u003cbr/\u003eThis allows people who don't know the city well to discover unusual places, learn the layout of the city, and avoid crowds of sightseers.\u003cbr/\u003eBoth Larry and his son are enthusiastic about using the geocache system.\u003cbr/\u003e\"As Sean said it takes you to places that you maybe wouldn't normally go to. And there's probably a level of detail like certain sculptures and little odd things about the city that you see that aren't on any real tourist map. So it's a lot of fun to just walk the city,\" Larry says.\u003cbr/\u003eThe Ryans head for a second cache - this one has a hint that will help them to locate it.\u003cbr/\u003eThey look around a painted statue on a downtown street corner, finding the cache underneath.\u003cbr/\u003eThis cache has just enough room to hide the log where they will write their names and to hold the \"path tag\" they've made with the name \"Familie Ryan.\"\u003cbr/\u003eSean puts the cache back in its place, and the team is ready to move on in search of more geocaches. \u003cbr/\u003eBut the experience is far more important than what they will find - geocaching offers a great chance for this father and son duo to work together on a fun challenge as they explore the City by the Bay.\u003cbr/\u003e\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='action-container flex justify-between'\u003e\n\u003cbutton aria-expanded='false' aria-label='Read more description' class='rp-full-description' 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