{"id":587,"date":"2026-06-18T05:05:47","date_gmt":"2026-06-18T05:05:47","guid":{"rendered":"https:\/\/www.mickeydesigns.com\/home\/?p=587"},"modified":"2026-06-18T13:50:19","modified_gmt":"2026-06-18T13:50:19","slug":"zerotosixty-help-troubleshooting","status":"publish","type":"post","link":"https:\/\/www.mickeydesigns.com\/home\/zerotosixty-help-troubleshooting\/","title":{"rendered":"ZeroToSixty \u2014 Help &amp; Troubleshooting Guide"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">ZeroToSixty \u2014 Help &amp; Troubleshooting<\/h2>\n\n\n\n<!-- ZeroToSixty \u2014 Help & Troubleshooting -->\n<!-- Paste this into a Custom HTML block in WordPress -->\n\n<style>\n.zts-guide { max-width: 800px; margin: 0 auto; font-size: 16px; line-height: 1.7; color: inherit; }\n.zts-guide h2 { font-size: 1.4em; margin: 2em 0 0.5em; padding-bottom: 0.3em; border-bottom: 1px solid #e0e0e0; }\n.zts-guide h3 { font-size: 1.1em; margin: 1.6em 0 0.4em; }\n.zts-guide p { margin: 0 0 1em; }\n.zts-guide ul, .zts-guide ol { margin: 0 0 1em 1.5em; padding: 0; }\n.zts-guide li { margin-bottom: 0.4em; }\n.zts-guide code { font-family: monospace; font-size: 0.9em; background: #f4f4f4; padding: 2px 5px; border-radius: 3px; }\n.zts-guide pre { background: #f4f4f4; border-left: 3px solid #ccc; padding: 1em; overflow-x: auto; border-radius: 3px; margin: 0 0 1em; }\n.zts-guide pre code { background: none; padding: 0; }\n.zts-guide table { width: 100%; border-collapse: collapse; margin: 0 0 1.5em; font-size: 0.95em; }\n.zts-guide th { background: #f4f4f4; text-align: left; padding: 8px 12px; border: 1px solid #ddd; font-weight: 600; }\n.zts-guide td { padding: 8px 12px; border: 1px solid #ddd; vertical-align: top; }\n.zts-guide blockquote { border-left: 3px solid #ccc; margin: 1em 0; padding: 0.6em 1.2em; background: #fafafa; color: #555; border-radius: 0 3px 3px 0; }\n.zts-guide blockquote p:last-child { margin: 0; }\n.zts-guide a { color: inherit; }\n.zts-guide strong { font-weight: 600; }\n.zts-toc { background: #fafafa; border: 0.5px solid #ddd; border-radius: 4px; padding: 1rem 1.25rem; margin: 0 0 2em; }\n.zts-toc h3 { margin: 0 0 0.6em; }\n.zts-toc ol { margin: 0; }\n<\/style>\n\n<div class=\"zts-guide\">\n\n<p>ZeroToSixty turns your iPhone into a GPS-based performance timer. Measure your 0\u201360 MPH (or 0\u2013100 KM\/H) time, run the quarter mile, and keep a history of every attempt. This guide covers how to use the app and how to fix the most common problems.<\/p>\n\n<div class=\"zts-toc\">\n  <h3>Table of Contents<\/h3>\n  <ol>\n    <li><a href=\"#getting-started\">Getting Started<\/a><\/li>\n    <li><a href=\"#how-to-record\">How to Record a Run<\/a><\/li>\n    <li><a href=\"#settings\">Settings Explained<\/a><\/li>\n    <li><a href=\"#troubleshooting\">Troubleshooting<\/a><\/li>\n    <li><a href=\"#safety\">Safety &amp; Legal<\/a><\/li>\n    <li><a href=\"#privacy\">Privacy<\/a><\/li>\n  <\/ol>\n<\/div>\n\n<h2 id=\"getting-started\">Getting Started<\/h2>\n\n<h3>What you need<\/h3>\n\n<ul>\n  <li>An iPhone with GPS (any model with cellular or a dedicated GPS chip)<\/li>\n  <li>A clear view of the sky for the best GPS accuracy<\/li>\n  <li>Location permission granted to ZeroToSixty<\/li>\n<\/ul>\n\n<h3>First launch<\/h3>\n\n<ol>\n  <li>Open the app. You&#8217;ll see a one-time notice explaining that iOS delivers GPS speed about once per second.<\/li>\n  <li>Tap <strong>Got it<\/strong>.<\/li>\n  <li>When prompted, allow location access by tapping <strong>Allow While Using App<\/strong>.<\/li>\n  <li>Mount your phone securely in your vehicle (windshield or dash mount works best).<\/li>\n<\/ol>\n\n<h2 id=\"how-to-record\">How to Record a Run<\/h2>\n\n<ol>\n  <li>Open the <strong>Speedometer<\/strong> tab.<\/li>\n  <li>Choose your <strong>target<\/strong>: <code>0-60<\/code> (MPH) or <code>0-100<\/code> (KM\/H).<\/li>\n  <li>Choose a <strong>start mode<\/strong>:\n    <ul>\n      <li><strong>Stop<\/strong> \u2014 timing begins the moment you start moving from a standstill.<\/li>\n      <li><strong>Rolling<\/strong> \u2014 timing begins when you cross 5, 10, or 15 MPH.<\/li>\n    <\/ul>\n  <\/li>\n  <li>Tap <strong>Arm<\/strong>. The timers switch to the orange <strong>Armed<\/strong> state.<\/li>\n  <li>Begin your run. The timer auto-starts when you cross the start threshold and stops when you hit the target speed (or complete the quarter mile).<\/li>\n  <li>The result is saved automatically to <strong>History<\/strong> when the run is marked <strong>Done<\/strong>.<\/li>\n  <li>Tap <strong>Reset<\/strong> to clear and prepare for another run.<\/li>\n<\/ol>\n\n<h3>Reading the screen<\/h3>\n\n<ul>\n  <li><strong>Big number<\/strong> \u2014 current speed in your chosen unit.<\/li>\n  <li><strong>Progress bar<\/strong> \u2014 how close you are to your target (green \u2192 yellow \u2192 red).<\/li>\n  <li><strong>Heading row<\/strong> \u2014 compass direction and your top speed for the session.<\/li>\n  <li><strong>Timer cards<\/strong> \u2014 show state badges: <strong>Idle<\/strong>, <strong>Armed<\/strong>, <strong>Running<\/strong>, <strong>Done<\/strong>.<\/li>\n<\/ul>\n\n<h2 id=\"settings\">Settings Explained<\/h2>\n\n<h3>Speed Unit<\/h3>\n\n<p>Tap the gauge icon to switch between:<\/p>\n\n<ul>\n  <li><strong>MPH (GPS)<\/strong> \/ <strong>KM\/H (GPS)<\/strong> \u2014 speed as reported directly by iOS. Smoothest reading.<\/li>\n  <li><strong>MPH (Corrected)<\/strong> \/ <strong>KM\/H (Corrected)<\/strong> \u2014 speed calculated from the distance between GPS fixes. Reacts faster but can be noisier.<\/li>\n  <li><strong>M\/S<\/strong> \u2014 meters per second, useful for unit comparisons.<\/li>\n<\/ul>\n\n<h3>Target Speed<\/h3>\n\n<p>Switch between <code>0-60 MPH<\/code> and <code>0-100 KM\/H<\/code> using the flag icon.<\/p>\n\n<h3>Start Mode<\/h3>\n\n<ul>\n  <li><strong>Stop<\/strong> \u2014 best for a true 0\u201360. Requires the phone to see you below ~1 MPH before arming.<\/li>\n  <li><strong>Rolling<\/strong> \u2014 start the timer at 5, 10, or 15 MPH. Useful when you can&#8217;t safely launch from a dead stop.<\/li>\n<\/ul>\n\n<h2 id=\"troubleshooting\">Troubleshooting<\/h2>\n\n<h3>The speed reading lags behind my real speed<\/h3>\n\n<p>This is expected. iOS provides GPS speed updates only about once per second, so the on-screen number can trail your actual speed by up to a second.<\/p>\n\n<p><strong>Note:<\/strong> the 0\u201360 and quarter-mile times use precise GPS <em>timestamps<\/em>, not the displayed value. Your saved times are accurate even if the number on screen looks behind.<\/p>\n\n<p>If you want a more responsive (but noisier) reading, switch the speed unit to <strong>MPH (Corrected)<\/strong> or <strong>KM\/H (Corrected)<\/strong>.<\/p>\n\n<h3>The timer never starts<\/h3>\n\n<ul>\n  <li>Make sure you tapped <strong>Arm<\/strong>. The timer cards must show the orange <strong>Armed<\/strong> badge before a run.<\/li>\n  <li>If using <strong>From Stop<\/strong> mode, the app waits until you&#8217;re nearly stationary before triggering. Come to a complete stop, then accelerate.<\/li>\n  <li>If using <strong>Rolling Start<\/strong>, you must cross the rolling threshold (5, 10, or 15 MPH). Check that you&#8217;ve selected the right threshold.<\/li>\n  <li>Confirm location access (see below).<\/li>\n<\/ul>\n\n<h3>The speedometer shows 0 and never updates<\/h3>\n\n<ul>\n  <li><strong>Check location permission.<\/strong> Open Settings \u2192 Privacy &amp; Security \u2192 Location Services \u2192 ZeroToSixty \u2192 set to <strong>While Using the App<\/strong>.<\/li>\n  <li><strong>Make sure Location Services is on globally.<\/strong> Settings \u2192 Privacy &amp; Security \u2192 Location Services \u2192 toggle on.<\/li>\n  <li><strong>Step outside or away from tall buildings.<\/strong> GPS doesn&#8217;t work indoors or in parking garages.<\/li>\n  <li><strong>Disable Low Power Mode<\/strong> during a run \u2014 it can throttle background sensors.<\/li>\n  <li><strong>Restart the app<\/strong> by swiping it away from the App Switcher and reopening.<\/li>\n<\/ul>\n\n<h3>My 0\u201360 time looks too fast or too slow<\/h3>\n\n<ul>\n  <li><strong>GPS multipath.<\/strong> Tall buildings, tunnels, and tree canopies bounce GPS signals and can produce inaccurate speed samples. Run on open road for best results.<\/li>\n  <li><strong>Cold start.<\/strong> Wait 30\u201360 seconds after launching the app for the GPS to fully lock on before running.<\/li>\n  <li><strong>Phone placement.<\/strong> Mount the phone where it has a clear view of the sky. A dashboard or windshield mount is best. Stuffing it in a pocket or center console can degrade signal.<\/li>\n  <li><strong>Rolling start with a low threshold.<\/strong> Even at 5 MPH, your true 0\u201360 time will be slightly shorter than the elapsed time shown.<\/li>\n<\/ul>\n\n<h3>The quarter-mile distance never reaches 1320 ft \/ 402 m<\/h3>\n\n<ul>\n  <li>The app accumulates distance from each GPS fix. Poor signal can drop fixes and stall the distance counter.<\/li>\n  <li>Make sure you actually traveled the full distance \u2014 the run only marks <strong>Done<\/strong> when 402 m have accumulated.<\/li>\n  <li>If a single fix jumps more than 200 m (likely a GPS glitch), that delta is ignored to protect the run from spikes.<\/li>\n<\/ul>\n\n<h3>Top speed seems wrong<\/h3>\n\n<p>Top speed records the highest GPS-reported speed during the session. It&#8217;s reset whenever you tap <strong>Reset<\/strong> or <strong>Arm<\/strong> a new run.<\/p>\n\n<h3>History shows nothing after a run<\/h3>\n\n<ul>\n  <li>A run is only saved when the timer reaches the <strong>Done<\/strong> state. If you hit <strong>Reset<\/strong> before the run completed, it isn&#8217;t saved.<\/li>\n  <li>Pull down to refresh the History tab, or switch tabs and back.<\/li>\n  <li>If the issue persists, force-quit and reopen the app.<\/li>\n<\/ul>\n\n<h3>How do I delete a run from History?<\/h3>\n\n<ul>\n  <li>Swipe left on any run for a delete button.<\/li>\n  <li>Or tap <strong>Edit<\/strong> in the top-right and tap the red minus next to each run you want to remove.<\/li>\n<\/ul>\n\n<h3>How do I filter History?<\/h3>\n\n<p>Tap the filter icon in the top-left of the History tab and choose <strong>All<\/strong>, <strong>0\u201360 MPH<\/strong>, <strong>0\u2013100 KM\/H<\/strong>, or <strong>Quarter Mile<\/strong>.<\/p>\n\n<h3>The screen keeps turning off mid-run<\/h3>\n\n<p>The app already prevents auto-lock while the Speedometer tab is visible. If your screen still locks:<\/p>\n\n<ul>\n  <li>Make sure you haven&#8217;t switched away from the Speedometer tab.<\/li>\n  <li>Check that <strong>Auto-Lock<\/strong> in iOS Settings \u2192 Display &amp; Brightness isn&#8217;t being overridden by Low Power Mode.<\/li>\n<\/ul>\n\n<h3>CarPlay doesn&#8217;t show ZeroToSixty<\/h3>\n\n<ul>\n  <li>Connect your iPhone to your car (wired or wireless CarPlay).<\/li>\n  <li>In your car&#8217;s CarPlay screen, look for the ZeroToSixty icon. You may need to customize the CarPlay app order in iOS Settings \u2192 General \u2192 CarPlay \u2192 [Your Car] \u2192 Customize.<\/li>\n  <li>Some older head units do not support newer CarPlay templates.<\/li>\n<\/ul>\n\n<h3>The compass heading is wrong or stuck<\/h3>\n\n<ul>\n  <li>Calibrate the compass by waving your iPhone in a figure-eight motion.<\/li>\n  <li>Move away from large metal objects (engine blocks, speakers, magnetic mounts) which can interfere with the magnetometer.<\/li>\n  <li>Confirm <strong>Compass Calibration<\/strong> is enabled in Settings \u2192 Privacy &amp; Security \u2192 Location Services \u2192 System Services.<\/li>\n<\/ul>\n\n<h3>Numbers don&#8217;t match my car&#8217;s speedometer<\/h3>\n\n<p>Car speedometers are required by law to read slightly <em>high<\/em> \u2014 typically 2\u20135% over actual speed \u2014 so the GPS-based reading in ZeroToSixty will usually be slightly lower than what your dashboard shows. The app&#8217;s GPS reading is closer to true ground speed.<\/p>\n\n<h2 id=\"safety\">Safety &amp; Legal<\/h2>\n\n<ul>\n  <li><strong>Never operate the app while driving.<\/strong> Have a passenger handle Arm\/Reset, or use a closed course.<\/li>\n  <li>Only run performance tests on a <strong>legal, closed course or private track<\/strong>.<\/li>\n  <li>Obey all traffic laws. The developer is not responsible for misuse.<\/li>\n<\/ul>\n\n<h2 id=\"privacy\">Privacy<\/h2>\n\n<ul>\n  <li>ZeroToSixty uses your location <strong>only while the app is open<\/strong>, only to measure speed and distance.<\/li>\n  <li>Location data is <strong>never<\/strong> uploaded, shared, or stored off-device.<\/li>\n  <li>Run history is stored locally on your iPhone using Apple&#8217;s SwiftData. Deleting the app removes all run history.<\/li>\n<\/ul>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>ZeroToSixty \u2014 Help &amp; Troubleshooting ZeroToSixty turns your iPhone into a GPS-based performance timer. Measure your 0\u201360 MPH (or 0\u2013100 KM\/H) time, run the quarter mile, and keep a history of every attempt. This guide covers how to use the app and how to fix the most common problems. Table of Contents Getting Started How &#8230; <a title=\"ZeroToSixty \u2014 Help &amp; Troubleshooting Guide\" class=\"read-more\" href=\"https:\/\/www.mickeydesigns.com\/home\/zerotosixty-help-troubleshooting\/\" aria-label=\"Read more about ZeroToSixty \u2014 Help &amp; Troubleshooting Guide\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":380,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-587","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-help"],"_links":{"self":[{"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/posts\/587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/comments?post=587"}],"version-history":[{"count":2,"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/posts\/587\/revisions"}],"predecessor-version":[{"id":593,"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/posts\/587\/revisions\/593"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/media\/380"}],"wp:attachment":[{"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/media?parent=587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/categories?post=587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mickeydesigns.com\/home\/wp-json\/wp\/v2\/tags?post=587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}