{"id":77,"date":"2009-11-02T09:30:07","date_gmt":"2009-11-02T13:30:07","guid":{"rendered":"http:\/\/www.divetalking.com\/?p=77"},"modified":"2021-06-07T20:56:55","modified_gmt":"2021-06-08T00:56:55","slug":"calculating-no-decompression-time-ndt","status":"publish","type":"post","link":"https:\/\/www.divetalking.com\/?p=77","title":{"rendered":"Calculating No Decompression Limit, NDL"},"content":{"rendered":"<p style=\"text-align: left;\">We will start with the DSAT Air Tables. simply known as the Recreational<br \/>\nDive Planner, RDP.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.divetalking.com\/?attachment_id=118\" rel=\"attachment wp-att-118\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-118 aligncenter\" title=\"AIR-RDP\" src=\"https:\/\/www.divetalking.com\/wp-content\/uploads\/2021\/06\/Air-RDP_3.jpg\" alt=\"\" width=\"396\" height=\"274\" \/><\/a><\/p>\n<p>Using your DSAT Air Table, position the card so it looks\u00a0like what you<br \/>\nsee above.<\/p>\n<p>Dive tables, what are they? Why do they exist? Why do I need to understand<br \/>\nhow to use a dive table? If I have and use a computer, do I still need to know<br \/>\nhow to use a dive table?<\/p>\n<p>Dive tables may be found in many forms. They may be online, on a hard<br \/>\nplastic, water proof card, they may be flexible and\/or foldable but what they<br \/>\nall contain is a method to calculate our bottom times, surface interval times<br \/>\nbased on our planned depth, time at depth and our time between dives.<\/p>\n<p><span style=\"color: #ff6600;\">Is it important to know how to work your dive tables? <\/span>One question<br \/>\nasked &#8220;<span style=\"color: #008000;\">If I&#8217;m wearing a computer and the computer calculates<br \/>\nall that stuff about my depths, times, surface times, and tells<br \/>\nme when to come up, when I can go back into the water,\u00a0 do I<br \/>\nneed to understand dive tables?<\/span>&#8221;\u00a0 That is true and a good question.<br \/>\nWhat happens when your computer fails or your transmitter fails? What<br \/>\ndo you use then? Computers failing have happened four times to me.<\/p>\n<p>Another reason to know your tables is it is the basics. Understanding<br \/>\nthe fundamentals will make learning more complex calculations easier<br \/>\nshould you decide to advance towards deeper or technical diving.<\/p>\n<p><span style=\"color: #666699;\"><strong>Table 1, the No Decompression Limits and Group Designation Table.<\/strong><\/span><br \/>\nLet&#8217;s get familiar with the tables. Looking in the upper Left Corner of the card you<br \/>\nwill find the word <strong>START<\/strong>. The column of words below the <strong>START<\/strong> act as legends.<br \/>\nJust below START you find, <strong>DEPTH (feet)<\/strong> <strong>&gt; <\/strong>followed by a row of boxes with<br \/>\nnumbers in them. Those numbers represent <strong>(feet)<\/strong>.<br \/>\n(Your RDP may read meters and your boxes of numbers will represent meters)<br \/>\nEach one of the Depths have a column of alternating <span style=\"color: #3366ff;\">blue <\/span>and <span style=\"color: #ffffff;\">white<\/span> boxes.<br \/>\nThe numbers in each of the alternating boxes represent TIME at depth.<br \/>\nFor example: Locate the DEPTH for 60 feet. Following the column of numbers<br \/>\nfound below the 60 foot box, they lead you to a BLACK box with the number<br \/>\n55 in it. So far so good.<\/p>\n<p>The numbers found below the depth box are minutes at that depth. For example<br \/>\nthe numbers found below the 60 foot column are 6, 11, 14, etc..<\/p>\n<p>Locate the Alpla-characters on the LEFT side of the card. The letters run<br \/>\ndownwards from <strong>A<\/strong> to <strong>Z<\/strong>. These characters are an alpha representation of<br \/>\nsome amount of\u00a0Nitrogen loaded into your tissues due to the pressure of the<br \/>\ndepths you plan to dive. We need to know this to keep track of the amount of<br \/>\nNitrogen building up in our tissues. We must take\u00a0the appropriate action to<br \/>\n&#8220;off gas&#8221; that extra nitrogen, either before we surface, as in a &#8220;Safety Stop&#8221;\u00a0or<br \/>\nduring our &#8220;Surface Interval.&#8221;<\/p>\n<p>Using the 60 foot column, move down to the box containing 33. Following<br \/>\nthe row to the left, it leads you to one of those Alpha Characters. The Aplha-<br \/>\nCharacter, Pressure Group\u00a0you should have identified is . . . . <strong>M<\/strong>.<br \/>\nTherefore a planned dive to 60 feet for 33 minutes places you in the<br \/>\nPressure Group, M when you leave that depth to end your dive.<\/p>\n<p>Let&#8217;s expand that Pressure Group thingy a bit.\u00a0The Pressure Group is<br \/>\nbased on all sorts of results from scientific studies , formulas, dopper<br \/>\nmapping of air bubbles, and more. We as consumers trust the tables and in<br \/>\nusing them understand that the tables do not take into consideration all the<br \/>\ndifferences we have\u00a0physilogcally, psychologically. This means that while<br \/>\ntwo individuals follow the exact same profile, one may feel the effects of<br \/>\ngasses\u00a0 more than another.<\/p>\n<p>Getting back to the example of ending the dive as an M diver, our goal is<br \/>\nto drive our nitrogen load from its M position on the Pressure Group down<br \/>\ntowards the A character, always. We do this by lessening the pressure and<br \/>\nwe lessen the pressure simply by\u00a0rising in the water column.<\/p>\n<p>Continuing,\u00a0you exit the water from the dive as an M diver. That leads us to table 2,<br \/>\nthe bottom right half of the RDP. <span style=\"color: #888888;\"><strong><span style=\"color: #666699;\">Table 2 is our Surface Interval Credit Table<\/span><\/strong><\/span>.<br \/>\nThis table credits you back with time that can be applied towards your next dive.<\/p>\n<p>Again, located the 60 foot column and the 33 minute block. Moving towards<br \/>\nthe right, we find an Alpha, M and to the right of the M are small squares. Each<br \/>\nsquare is cut in half containing a time-range. The first block contains 0:00 \/ 0:04.<br \/>\nthat represents the range from 0:00 minutes to 0:04 minutes on the surface.<br \/>\nThe next block to the right contains 0:05 \/ 0:09 and represents 5 to 9 minutes<br \/>\non the surface, etc. Let&#8217;s say you plan to spend 58 minutes on the surface between<br \/>\nthe dive you just completed to 60 feet for 33 minutes and your next planned dive.<br \/>\nIf you follow the column down from the block containing 0:56 \/ 1:04, you will find<br \/>\nthe Alpha character <strong>D<\/strong>.<\/p>\n<p>What does the above all mean? It tells you that after exiting the water as an M<br \/>\ndiver and spending 58 minutes on the surface, enough Nitrogen has theoretically<br \/>\nhas been removed from your body to move you from Pressure Group M to<br \/>\nPressure Group D. Remember that your goal is to always move towards the<br \/>\nPressure Group A.<\/p>\n<p>Now, turn the card over. The design is to flip the card bottom up and over, vs<br \/>\nlike a page in a book. You should see Table 3<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-133 aligncenter\" src=\"https:\/\/www.divetalking.com\/wp-content\/uploads\/2009\/11\/padiplanner2-250x170.jpg\" alt=\"ERDP2\" width=\"400\" height=\"320\" \/><\/p>\n<p><strong><span style=\"color: #666699;\">Table 3 is the Repetative Dive Timetable<\/span><\/strong> and is used to calculate the<br \/>\namount of time you have for your next dive. Note, since you are entering the<br \/>\nwater \u00a0with a Pressure Group of D, your bottom time will not be as long as if<br \/>\nyou entered the water with a Pressure Group A. Let&#8217;s figure out how much<br \/>\ntime you will be allowed for your next dive.<\/p>\n<p>The question is, what is the depth for your second dive? Let&#8217;s presume<br \/>\n45 feet. Locate the Pressure Group D found at the top of Table 3. Continue<br \/>\nfollowing down the same column until you reach the line for the depth<br \/>\nyou plan to dive. We said 45 feet. Since there is no row with 45 feet on it,<br \/>\nyou much use the next deeper depth, 50.<\/p>\n<p>Following the D column down to where the 50 foot depth row meets the<br \/>\nblock containing a couple of nubers. Note\u00a0each block is split into two values.<br \/>\nA value in a half white and a number in a half blue box. The specific box for<br \/>\nthis example should contain\u00a0 21 \/ 59.<\/p>\n<p>Note near the bottom right of table 3 is a legend. There you will find an<br \/>\nexplaination of what those two numbers mean. I&#8217;ll explain, The number at the<br \/>\ntop (white section) is the residual time (the penalty). This number represents<br \/>\nthe amount of Nitrogen, in time, still in the body. It is this time that must be<br \/>\nadded to your actual Bottom time. Thats where the number in the blue<br \/>\nfield represents, the new maximum amount of time at 50 feet.<br \/>\nIn your case, you may spend no more than 59 minutes at 50 feet. Thats what<br \/>\nthe 59 in 21\/59 means.<\/p>\n<p>Let&#8217;s plan the second dive to be no more than 59 minutes then. Let&#8217;s plan<br \/>\nfor a 40 minute dive. So the question I have is, after spending 40 minutes<br \/>\nat 45 feet, what pressure group do you end up in?<br \/>\n(Turn to Table 1 to figure out your Pressure Group.)<br \/>\nLet&#8217;s walk\u00a0 through figuring what your Pressure Group will be after the<br \/>\nsecond dive.<\/p>\n<p>Table 1 does not have a 45 foot depth, so we use the 50 foot column.<br \/>\nAdd the 21 minutes of residual nitrogen time, (nitrogen still in your body)<br \/>\nto the Actual Bottom time of 40 minutes, you get 61 minutes.<\/p>\n<p>Move down the column until you reach\u00a061 minutes. There is no\u00a061 minute<br \/>\nbox, you round up to the next higher and nearest minute, which is 63.<br \/>\nWhat is your Pressure Group? If you said <strong>T<\/strong>, you are correct.<\/p>\n<p>Lets summarize,<br \/>\nDive tables exist so we have a tool to calculate bottom time or time we need<br \/>\nto spend on the surface between dive or to calculate our maximum depths.<br \/>\nDive tables may be used in a number of ways. They represent a fundamental<br \/>\ntool\u00a0in managing gas (nitrogen in this case) loading\/unloading.<br \/>\nDive tables exist for your safety. The more you use them, the easier they<br \/>\nbecome. It is important to understand tables for a number of reasons. One<br \/>\nof those reasons is they serve as a tool in calculating dive times, surface times,<br \/>\nnitrogen loads to help keep you out of decompression. Dive tables are not<br \/>\nsecondary to computers but a compliment.<\/p>\n<p><span style=\"color: #008000;\">Exercise:<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"color: #008000;\">You are planning a three tank dive with some friends. Before you sit down to<br \/>\ndiscuss\/plan the dives you want to show your friends that you are spot on<br \/>\nwhen it comes to calculating No Decompression times.\u00a0 You begin planning<br \/>\nsome dives to present to your friends.<\/span><\/p>\n<p><span style=\"color: #008000;\">Here is what you are to plan:<br \/>\n( Calculate the MAXIMUM amount of time you may spend at each<br \/>\nsubsequent depth. Show your work in your post. )<br \/>\n<\/span><\/p>\n<p><span style=\"color: #008000;\">\u00a0\u00a0\u00a0 \u00a0Your first dive will be to 87 feet for 20 minutes.<br \/>\nWhat is your pressure group after ending this first dive?<\/span><\/p>\n<p><span style=\"color: #008000;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Your second dive will be to 58 feet for XXX minutes?<br \/>\nWhat pressure group will you enter the water with?<br \/>\nWhat Pressure Group do you end the\u00a0second dive\u00a0at?<\/span><\/p>\n<p><span style=\"color: #008000;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Your third dive will be to 48 feet for YYY minutes?<br \/>\nWhat pressure group will you enter the water with?<br \/>\nWhat Pressure Group do you end the third dive at?<\/span><\/p>\n<p><span style=\"color: #99cc00;\"><span style=\"color: #000000;\"><br \/>\nLarry Davis<\/span><\/span><\/p>\n<p><a href=\"https:\/\/www.divetalking.com\/?p=7543\">Take the Recreational Dive Planner Quiz<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We will start with the DSAT Air Tables. simply known as the Recreational<br \/>\nDive Planner, RDP.<\/p>\n<p>Using your DSAT Air Table, position the card so it looks\u00a0like what you<br \/>\nsee above.<br \/>\nDive tables, what are they? Why do they exist? Why do I need to understand<br \/>\nhow to use a dive table? If I have and use a computer, do I still need to know<br \/>\nhow to use a dive table?<br \/>\nDive tables may be found in many forms. They may be online, on a hard<br \/>\nplastic, water proof card, they may be flexible and\/or foldable but what they<br \/>\nall contain is a method to calculate our bottom times, surface interval times<br \/>\nbased on our planned depth, time at depth and our time between dives.<br \/>\nIs it important to know how to work your dive tables? One question<br \/>\nasked &#8220;If I&#8217;m wearing a computer and the computer calculates<br \/>\nall that stuff about my depths, times, surface times, and tells<br \/>\nme when to come up, &#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43,171,172,3,299,300,32,17],"tags":[],"class_list":["post-77","post","type-post","status-publish","format-standard","hentry","category-diver","category-divetalking-2","category-education","category-ow","category-rdp","category-recreational-dive-planner","category-reference","category-training"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Calculating No Decompression Limit, NDL - Divetalking<\/title>\n<meta name=\"description\" content=\"Divetalking\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.divetalking.com\/?p=77\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Calculating No Decompression Limit, NDL\" \/>\n<meta property=\"og:description\" content=\"Divetalking\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.divetalking.com\/?p=77\" \/>\n<meta property=\"og:site_name\" content=\"Divetalking\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Divetalking\" \/>\n<meta property=\"article:published_time\" content=\"2009-11-02T13:30:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-06-08T00:56:55+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.divetalking.com\/wp-content\/uploads\/2021\/06\/Air-RDP_3.jpg\" \/>\n<meta name=\"author\" content=\"lars2923\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"lars2923\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77\"},\"author\":{\"name\":\"lars2923\",\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/#\\\/schema\\\/person\\\/e69ad3ca673a5c117fd560ec0f30453c\"},\"headline\":\"Calculating No Decompression Limit, NDL\",\"datePublished\":\"2009-11-02T13:30:07+00:00\",\"dateModified\":\"2021-06-08T00:56:55+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77\"},\"wordCount\":1615,\"image\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/www.divetalking.com\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/Air-RDP_3.jpg\",\"articleSection\":[\"Diver\",\"Divetalking\",\"Education\",\"Open Water\",\"RDP\",\"Recreational Dive Planner\",\"Reference\",\"Training\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77\",\"url\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77\",\"name\":\"Calculating No Decompression Limit, NDL - Divetalking\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/www.divetalking.com\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/Air-RDP_3.jpg\",\"datePublished\":\"2009-11-02T13:30:07+00:00\",\"dateModified\":\"2021-06-08T00:56:55+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/#\\\/schema\\\/person\\\/e69ad3ca673a5c117fd560ec0f30453c\"},\"description\":\"Divetalking\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.divetalking.com\\\/?p=77\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77#primaryimage\",\"url\":\"http:\\\/\\\/www.divetalking.com\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/Air-RDP_3.jpg\",\"contentUrl\":\"http:\\\/\\\/www.divetalking.com\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/Air-RDP_3.jpg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=77#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.divetalking.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculating No Decompression Limit, NDL\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/#website\",\"url\":\"https:\\\/\\\/www.divetalking.com\\\/\",\"name\":\"Divetalking\",\"description\":\"The best thing to do during your surface interval\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.divetalking.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/#\\\/schema\\\/person\\\/e69ad3ca673a5c117fd560ec0f30453c\",\"name\":\"lars2923\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/09f3fe193ad4eef587ee9f5acb35a3b4499d0753ec1d3da07bd28646c1705a2c?s=96&d=mm&r=pg\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/09f3fe193ad4eef587ee9f5acb35a3b4499d0753ec1d3da07bd28646c1705a2c?s=96&d=mm&r=pg\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/09f3fe193ad4eef587ee9f5acb35a3b4499d0753ec1d3da07bd28646c1705a2c?s=96&d=mm&r=pg\",\"caption\":\"lars2923\"},\"description\":\"PADI MSDT - I've been a diver for over 33 years. I became an instructor because I want to be creditable and able to transfer my knowledge and skills to newer divers. Beside, it cuts down on the expense of diving. NOT! My Motto: First in, Last out\",\"sameAs\":[\"https:\\\/\\\/www.divetalking.com\"],\"url\":\"https:\\\/\\\/www.divetalking.com\\\/?author=2\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Calculating No Decompression Limit, NDL - Divetalking","description":"Divetalking","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.divetalking.com\/?p=77","og_locale":"en_US","og_type":"article","og_title":"Calculating No Decompression Limit, NDL","og_description":"Divetalking","og_url":"https:\/\/www.divetalking.com\/?p=77","og_site_name":"Divetalking","article_publisher":"https:\/\/www.facebook.com\/Divetalking","article_published_time":"2009-11-02T13:30:07+00:00","article_modified_time":"2021-06-08T00:56:55+00:00","og_image":[{"url":"http:\/\/www.divetalking.com\/wp-content\/uploads\/2021\/06\/Air-RDP_3.jpg","type":"","width":"","height":""}],"author":"lars2923","twitter_card":"summary_large_image","twitter_misc":{"Written by":"lars2923","Est. reading time":"8 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.divetalking.com\/?p=77#article","isPartOf":{"@id":"https:\/\/www.divetalking.com\/?p=77"},"author":{"name":"lars2923","@id":"https:\/\/www.divetalking.com\/#\/schema\/person\/e69ad3ca673a5c117fd560ec0f30453c"},"headline":"Calculating No Decompression Limit, NDL","datePublished":"2009-11-02T13:30:07+00:00","dateModified":"2021-06-08T00:56:55+00:00","mainEntityOfPage":{"@id":"https:\/\/www.divetalking.com\/?p=77"},"wordCount":1615,"image":{"@id":"https:\/\/www.divetalking.com\/?p=77#primaryimage"},"thumbnailUrl":"http:\/\/www.divetalking.com\/wp-content\/uploads\/2021\/06\/Air-RDP_3.jpg","articleSection":["Diver","Divetalking","Education","Open Water","RDP","Recreational Dive Planner","Reference","Training"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.divetalking.com\/?p=77","url":"https:\/\/www.divetalking.com\/?p=77","name":"Calculating No Decompression Limit, NDL - Divetalking","isPartOf":{"@id":"https:\/\/www.divetalking.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.divetalking.com\/?p=77#primaryimage"},"image":{"@id":"https:\/\/www.divetalking.com\/?p=77#primaryimage"},"thumbnailUrl":"http:\/\/www.divetalking.com\/wp-content\/uploads\/2021\/06\/Air-RDP_3.jpg","datePublished":"2009-11-02T13:30:07+00:00","dateModified":"2021-06-08T00:56:55+00:00","author":{"@id":"https:\/\/www.divetalking.com\/#\/schema\/person\/e69ad3ca673a5c117fd560ec0f30453c"},"description":"Divetalking","breadcrumb":{"@id":"https:\/\/www.divetalking.com\/?p=77#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.divetalking.com\/?p=77"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.divetalking.com\/?p=77#primaryimage","url":"http:\/\/www.divetalking.com\/wp-content\/uploads\/2021\/06\/Air-RDP_3.jpg","contentUrl":"http:\/\/www.divetalking.com\/wp-content\/uploads\/2021\/06\/Air-RDP_3.jpg"},{"@type":"BreadcrumbList","@id":"https:\/\/www.divetalking.com\/?p=77#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.divetalking.com\/"},{"@type":"ListItem","position":2,"name":"Calculating No Decompression Limit, NDL"}]},{"@type":"WebSite","@id":"https:\/\/www.divetalking.com\/#website","url":"https:\/\/www.divetalking.com\/","name":"Divetalking","description":"The best thing to do during your surface interval","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.divetalking.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.divetalking.com\/#\/schema\/person\/e69ad3ca673a5c117fd560ec0f30453c","name":"lars2923","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/09f3fe193ad4eef587ee9f5acb35a3b4499d0753ec1d3da07bd28646c1705a2c?s=96&d=mm&r=pg","url":"https:\/\/secure.gravatar.com\/avatar\/09f3fe193ad4eef587ee9f5acb35a3b4499d0753ec1d3da07bd28646c1705a2c?s=96&d=mm&r=pg","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/09f3fe193ad4eef587ee9f5acb35a3b4499d0753ec1d3da07bd28646c1705a2c?s=96&d=mm&r=pg","caption":"lars2923"},"description":"PADI MSDT - I've been a diver for over 33 years. I became an instructor because I want to be creditable and able to transfer my knowledge and skills to newer divers. Beside, it cuts down on the expense of diving. NOT! My Motto: First in, Last out","sameAs":["https:\/\/www.divetalking.com"],"url":"https:\/\/www.divetalking.com\/?author=2"}]}},"_links":{"self":[{"href":"https:\/\/www.divetalking.com\/index.php?rest_route=\/wp\/v2\/posts\/77","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.divetalking.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.divetalking.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.divetalking.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.divetalking.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=77"}],"version-history":[{"count":0,"href":"https:\/\/www.divetalking.com\/index.php?rest_route=\/wp\/v2\/posts\/77\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.divetalking.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=77"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.divetalking.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=77"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.divetalking.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=77"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}