{"id":31166,"date":"2021-02-09T17:40:09","date_gmt":"2021-02-09T17:40:09","guid":{"rendered":"https:\/\/www.skydivemag.com\/new\/?p=31166"},"modified":"2021-02-17T08:22:23","modified_gmt":"2021-02-17T08:22:23","slug":"speed-monkey","status":"publish","type":"post","link":"https:\/\/www.skydivemag.com\/new\/speed-monkey\/","title":{"rendered":"Speed Monkey"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">How fast am I flying?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">This question prompted David Walden to start working on his version of an&nbsp;<strong>airspeed indicator for BASE<\/strong>&#8230;<\/h3>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI-1024x576.jpg\" alt=\"\" class=\"wp-image-31788\" srcset=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI-1024x576.jpg 1024w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI-300x169.jpg 300w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI-768x432.jpg 768w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI-1536x864.jpg 1536w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI-400x225.jpg 400w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI-860x484.jpg 860w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI.jpg 1720w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>The Speed Monkey flashes red for danger<\/figcaption><\/figure>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">Like everyone else I get my cues from visuals, noise, feeling and body position. But how good am I really at knowing my speed? The hero in me says I&#8217;m fine; reality says otherwise.<\/h4>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The more I jump, the less I seem to know, and last year I gave myself a scare by flying too slowly. In certain situations I&#8217;m quite good at convincing myself that I have enough speed&#8230; just to get over that ridgeline or pass the notch or whatever. A quick look at The List and you&#8217;ll see I&#8217;m not the only one who does this. The problem is that even though we train this stuff, we are not infallible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So after a lot of procrastinating followed by a lot of work, here is my version of an&nbsp;<strong>airspeed indicator for BASE.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"973\" height=\"648\" src=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-on-helmet-@2.jpg\" alt=\"\" data-id=\"31188\" data-full-url=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-on-helmet-@2.jpg\" data-link=\"https:\/\/www.skydivemag.com\/new\/speed-monkey\/speed-monkey-on-helmet-2\/#main\" class=\"wp-image-31188\" srcset=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-on-helmet-@2.jpg 973w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-on-helmet-@2-300x200.jpg 300w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-on-helmet-@2-768x511.jpg 768w\" sizes=\"auto, (max-width: 973px) 100vw, 973px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"980\" height=\"646\" src=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-on-helmet-@1.jpg\" alt=\"\" data-id=\"31189\" data-full-url=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-on-helmet-@1.jpg\" data-link=\"https:\/\/www.skydivemag.com\/new\/speed-monkey\/speed-monkey-on-helmet-1\/#main\" class=\"wp-image-31189\" srcset=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-on-helmet-@1.jpg 980w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-on-helmet-@1-300x198.jpg 300w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-on-helmet-@1-768x506.jpg 768w\" sizes=\"auto, (max-width: 980px) 100vw, 980px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-device-@2-FI-1024x576.jpg\" alt=\"\" data-id=\"31204\" data-full-url=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-device-@2-FI.jpg\" data-link=\"https:\/\/www.skydivemag.com\/new\/speed-monkey\/speed-monkey-device-2-fi\/#main\" class=\"wp-image-31204\" srcset=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-device-@2-FI-1024x576.jpg 1024w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-device-@2-FI-300x169.jpg 300w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-device-@2-FI-768x432.jpg 768w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-device-@2-FI-1536x864.jpg 1536w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-device-@2-FI-400x225.jpg 400w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-device-@2-FI-860x484.jpg 860w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-device-@2-FI.jpg 1720w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"375\" src=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-led-1.gif\" alt=\"\" data-id=\"31190\" data-full-url=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-led-1.gif\" data-link=\"https:\/\/www.skydivemag.com\/new\/speed-monkey\/speed-monkey-led-1\/#main\" class=\"wp-image-31190\"\/><\/figure><\/li><\/ul><figcaption class=\"blocks-gallery-caption\">The speed monkey is taped to my helmet so the light is in the periphery of my vision<\/figcaption><\/figure>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">OK, so what is it?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s not a new idea, but something I&#8217;ve thought about for a looooong time&#8230;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An LED mounted on my helmet that changes color depending on my speed. Speed is measured by GPS, and normalized for sea level. Because I usually only jump in zero or light wind, the speed given is a rough approximation of&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Indicated_airspeed\" target=\"_blank\" aria-label=\"undefined (opens in a new tab)\" rel=\"noreferrer noopener\">indicated airspeed<\/a>&nbsp;that could be got from a pitot tube.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The LED is angled towards my face and is bright enough to see in direct sunlight. I&#8217;ve mounted it just at the periphery of my vision.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The unit also has a removable SD card which holds a configuration file and stores log files.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So&#8230; there are only really three speeds I&#8217;m interested in:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong><span class=\"has-inline-color has-vivid-red-color\">RED:<\/span><\/strong> Too slow! Any speed below my best glide speed is too slow<\/li><li><strong><span class=\"has-inline-color has-vivid-cyan-blue-color\">BLUE<\/span><\/strong>: Best glide speed (max L\/D) give or take a few km\/h<\/li><li><strong><span class=\"has-inline-color has-vivid-green-cyan-color\">GREEN:<\/span><\/strong> Fast. Flying faster than best glide and with more energy.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">How it looks with my (very rough)&nbsp;<a href=\"https:\/\/squirrel.ws\/learn\/speed-to-fly\" target=\"_blank\" aria-label=\"undefined (opens in a new tab)\" rel=\"noreferrer noopener\">polar curve<\/a>&#8230;<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"721\" src=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-polar-cuve-1024x721.jpg\" alt=\"\" class=\"wp-image-31178\" srcset=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-polar-cuve-1024x721.jpg 1024w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-polar-cuve-300x211.jpg 300w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-polar-cuve-768x541.jpg 768w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-polar-cuve-1536x1081.jpg 1536w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-polar-cuve-2048x1441.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Wingsuit polar curve<\/figcaption><\/figure>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Speed Monkey in action<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Below is footage from one of my test flights in Jan this year \u2013 pretty much my favourite jump in NZ, Shark&#8217;s Tooth. The jump begins with a transport to the entry point for the line. There&#8217;s a ridge-line you can cross to enter the line higher, which I&#8217;ve done in the past. But now I got a red light from the Monkey and so bailed to enter the line lower and safer&#8230;<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading\"><em>Video: David Walden flying the Speed Monkey<\/em><\/h4>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Speed Monkey version 3\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/DEjP2u2bMrY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption>Demo &#8211; Speed Monkey airspeed indicator for BASE jumping<\/figcaption><\/figure>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Speed thresholds \/ colors<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Thresholds for each color can be changed. The full range of colors are&#8230;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>DIM GREEN<\/strong> &#8211; Standby mode when not moving (so not distracting at the exit)<\/li><li><strong>FLASHING RED<\/strong> &#8211; Very low speed<\/li><li><strong>RED<\/strong> &#8211; Low speed<\/li><li><strong>BLUE<\/strong> &#8211; Best glide speed, give or take<\/li><li><strong>GREEN<\/strong> &#8211; Faster than best glide<\/li><li><strong>OFF<\/strong> &#8211; Very fast<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">However not all colors need be used, so for example I&#8217;ve got it set like this for myself&#8230;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Dim green (standby)<\/strong>&nbsp;= less than 80 km\/h<\/li><li><strong>Flashing red<\/strong>&nbsp;= 80 to 130<\/li><li><strong>Blue<\/strong>&nbsp;= 130 to 140<\/li><li><strong>Green<\/strong>&nbsp;= more than 140<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe I&#8217;m stupid, but I&#8217;ve found having minimal colors is more useful as I can process the info more automatically while everything is going on.&nbsp;<strong>Flashing red means danger<\/strong>, that&#8217;s simple enough for me.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The speed thresholds are set in a text file on the SD card, which can be easily edited.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-configuration.png\" alt=\"\" class=\"wp-image-31179\" width=\"860\" srcset=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-configuration.png 850w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-configuration-300x173.png 300w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-configuration-768x444.png 768w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/><figcaption>Speed Monkey configuration<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Logging<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Jumps are logged to the SD card automatically. 10 data points per second by default. Logging only starts once I&#8217;m moving and stops at the landing. What happens while I&#8217;m standing at the exit is that it continually buffers 2 seconds of data, so that once it detects I&#8217;m in freefall it can go back and write that buffer to the log. So the jump is logged completely from push to landing, and nothing more. The log file is compatible with the Flysight viewer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">True airspeed vs indicated airspeed.<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>True airspeed<\/strong>&nbsp;is your actual speed through the air. In zero wind this is the same as the total 3D speed given by a GPS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Indicated airspeed<\/strong>&nbsp;is what you feel, and what is measured in aircraft with a pitot tube. At sea level (and standard air density) it\u2019s the same as true airspeed, but at higher altitude its less. For example at 3,000m if your <strong>indicated airspeed<\/strong> is 150 km\/h then true airspeed will be around 175.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We stall at a particular&nbsp;indicated airspeed&nbsp;regardless of altitude, so this is the measurement we want to know while flying. Speed Monkey takes GPS total speed, makes the assumption there is little or no wind, and using the altitude and a simple algorithm, converts it to indicated airspeed. The result is a little rough because atmospheric pressure and density are variable.&nbsp;More info <a href=\"https:\/\/www.boldmethod.com\/learn-to-fly\/aerodynamics\/why-true-airspeed-increases-with-altitude\/\" target=\"_blank\" aria-label=\"undefined (opens in a new tab)\" rel=\"noreferrer noopener\">here<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It won\u2019t work well if there&#8217;s much wind, because GPS total speed will deviate from true airspeed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The 3D speed of the GPS is logged as well as the indicated speed and the LED color. So I can use the log file to fine tune the speed thresholds where I think my best glide is.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">It looks like a Flysight<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is not a Flysight.&nbsp;<a href=\"http:\/\/flysight.ca\/\" target=\"_blank\" aria-label=\"undefined (opens in a new tab)\" rel=\"noreferrer noopener\">Flysight<\/a>&nbsp;is a genius tool for training flying performance. This is for safety, it helps me avoid making some stupid mistakes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I don&#8217;t use Flysight audio for BASE because I find it distracting. When everything is happening fast I prefer instant access to information using a visual indicator rather than audio.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI2-1024x576.jpg\" alt=\"\" class=\"wp-image-31790\" srcset=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI2-1024x576.jpg 1024w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI2-300x169.jpg 300w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI2-768x432.jpg 768w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI2-1536x864.jpg 1536w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI2-400x225.jpg 400w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI2-860x484.jpg 860w, https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/02\/speed-monkey-david-walden-FI2.jpg 1720w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Speed Monkey shows steady green for fast flying<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Drawbacks<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><strong><span class=\"has-inline-color has-luminous-vivid-amber-color\">Malfunctions.&nbsp;<\/span><\/strong>Could be bad to get an incorrect green light. Need to use some common sense.<\/li><li><strong><span class=\"has-inline-color has-luminous-vivid-amber-color\">Reliance.<\/span><\/strong>&nbsp;Could make me lazy about using my other senses for judging speed?<\/li><li><strong><span class=\"has-inline-color has-luminous-vivid-amber-color\">Distracting?<\/span><\/strong>&nbsp;Depends on where it\u2019s mounted and familiarity. I only check it occasionally&#8230; when I&#8217;m transporting, entering a line, going for glide and such.<\/li><li><strong><span class=\"has-inline-color has-luminous-vivid-amber-color\">Skydiving.<\/span>&nbsp;<\/strong>I don&#8217;t think it\u2019s much use, because usually there&#8217;s some wind on a skydive.<\/li><li><span class=\"has-inline-color has-luminous-vivid-amber-color\"><strong>Attachment to helmet.<\/strong>&nbsp;<\/span>Semi-permanent attachment using tape and double-sided sticky. A full face would need a different (smaller) LED &#8216;finger&#8217;.<\/li><li><strong><span class=\"has-inline-color has-luminous-vivid-amber-color\">SD card.<\/span><\/strong>&nbsp;Log is written to SD which has to be removed to copy to computer.<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.skydivemag.com\/new\/wp-content\/uploads\/2021\/01\/Speed-Monkey-device-1024x683.jpg\" alt=\"\" class=\"wp-image-31181\" width=\"860\" height=\"386\"\/><figcaption>Speed Monkey &#8216;undressed&#8217;<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Development<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is my fourth prototype. It\u2019s been way more work than I expected, but I&#8217;m stoked with how it\u2019s turning out. Version one was the size of a small brick on my helmet. Version 4 is 5x5cm and 2cm thick. It needs more field testing, and by more people.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It would be nice to incorporate the antenna inside the box. I found it was affecting the accuracy, and I don&#8217;t know much about RF so for now it\u2019s outside.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The next step would be to design a printed circuit board. It\u2019s a big step (for me at any rate), and I need to see what sort of interest there is for this first.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hardware<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Atmega32u4 8MHz microcontroller<\/li><li>Ublox 8 GPS: Zoe-M8Q 72 channel (GPS, GLONASS, BeiDou, Galileo constellations), 18Hz max update rate<\/li><li>180mAh rechargeable lipoly battery<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Software<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Programmed in C++, to be open source on Github.<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-pullquote\"><blockquote><p>\u201cTools like this provide great training references for jumpers to improve their flying and increase their ability to fly safely. We all think that we know how fast we are flying, but the difference between best glide airspeed and stall is very close in a wingsuit. Having this reference, for training (not to rely on, on a daily basis), is an additional and valuable training tool\u201d<\/p><cite>Matt Gerdes, CEO, Squirrel<\/cite><\/blockquote><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Acknowledgments<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Fran\u00e7ois Gouy<\/strong>&nbsp;gave me the idea years ago by hooking up LED&#8217;s to a pitot tube (mounted on a wind vane on his helmet).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Michael Cooper<\/strong>&nbsp;set the bar with Flysight and opened my mind to what can be done with a GPS.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to from here<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">At this point it\u2019s nothing more than an idea, a personal project, and a prototype. If anyone wants to build one I can itemize the hardware components and make my code available. If there is strong interest I can work on getting a PCB done, but there&#8217;s always going to be some amount of manual assembly in building the LED &#8216;finger&#8217;.  I welcome any comments\/ suggestions\/ criticism. Cheers!<\/p>\n\n\n\n<p class=\"has-text-align-right wp-block-paragraph\"><strong><em>FFI : Contact Dave or read about Speed Monkey on his <a href=\"http:\/\/david.walden.co.nz\/\" target=\"_blank\" aria-label=\"undefined (opens in a new tab)\" rel=\"noreferrer noopener\">website<\/a><\/em><\/strong><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"sfsi_plus_widget sfsi_plus_shortcode_container\"><div id=\"sfsi_plus_wDiv\"><\/div><div class=\"sfsiplus_norm_row sfsi_plus_wDiv\"  style=\"width:260px;text-align:left;position:absolute;\"><div style='width:60px;height:auto;margin-left:2.5px;margin-right:2.5px;margin-bottom:25px;transform: none !important;' class='sfsi_premium_wicons shuffeldiv sfsi_premium_tooltip_align_automatic ' ><div style='line-height:0;' class='sfsiplus_inerCnt' data-othericoneffect=''><a class=' sficn  sciconfront ' data-effect=''   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