Welcome to the Estimated Time of Arrival (ETA) App.!

A Patented Product of CheETAh Timing™

We hope you will enjoy the many performance benefits of the ETA App. This is a user’s guide for the GPS-enabled ETA App. which is designed for you to track your distance, performance and achieve your personal best finish times.


Two questions will be asked:

The Cheetah (ETA App.) screens stay on for the entire event (no/yes)

We suggest that the user choose Yes. The ETA screen and all functions will then remain on and viewable (i.e., the iPhone will not revert to its usual dark screen after a period of time) for the entire event only if this option was chosen when first turning on the ETA App. on the iPhone.

The ETA App. will also ask you to access your location.

Choose "Yes." This will enable the iPhone’s GPS connectivity which is vital for the ETA App. to provide pace, distance, ETA and other key functions.

  • Go to home page
  • Press the calendar icon located in far upper right of your screen
  • You are now in the "Create Event" Page
  • Enter Event Name
  • Enter Event Location
  • Enter Date (Note: it is in the DD/MM/YYY format)
  • Enter distance (up to 1,000; you can also choose tenths of a distance interval)
  • Choose interval type: Miles or Kilometers
  • Enter number of intervals. You can choose up to 1000 intervals over a given distance. For many users, they will want the distance to equal the number of intervals. However, to provide maximum flexibility, the intervals do not need to equal the distance amount. For example, if a user wants to track ½ mile pace times over five miles, they would choose a distance of five and 10 intervals.
  • Enter number of "look-back" intervals. This is one of the unique aspects of the patented ETA App. in addition to providing the user with ongoing ETA feedback. The number of look-back intervals is used to calculate accurate, smoothed average pace and ETA calculations at the end of each interval. Please see below for a detailed explanation and use of look-back intervals and ETA.
  • Enter the desired finish time. This is the same as your goal finish time (GFT).
  • To the right of “Activity” choose type of event (Walking, Running, Cycling or Other).
  • Hit the green "Create Event" bar at the bottom.
  • If all data has been entered correctly, you will receive a screen that says "Event has been created successfully."
  • Hit "OK" and you are then re-directed back to the home screen which will show, under "Active Events" your newly created event.
  • If any data point was not entered, the screen will notify the user which data point needs to be entered.

You are now ready to race or set off on your training course or other event!

Here’s How

  • Select the desired event now listed under Active Events in the home screen.
  • Press the start button (white triangle within the green circle). Once this is pressed, the timer and all other functions start.
  • Once the start button is pressed, the screen will default to the ETA Mode which displays:
  • ETA Mode(see image below):

    • Current Pace: This is the GPS enabled, instantaneous pace and NOT the pace found on the Chronometer page. This pace is provided as an additional tool and data point for the user. This pace is NOT the pace used to calculate the ETA. Since this pace is instantaneous, you may see significant variations to this pace due to hills, water breaks, etc.
    • ETA: This is the Estimated Time of Arrival. This provides, at the end of each interval, an accurate, estimated time to complete the event. The ETA is refreshed/ recalculated at the end of each interval. See below for more information on ETA.
    • Time Variance: This provides, at the end of each interval, the variance between the ETA and the user’s goal finish time (GFT). This informs the user how their ETA compares to their GFT so that the user can adjust pace accordingly throughout the event.
      If the user is behind GFT, the Time Variance will have a time with negative symbol (-). Conversely, if the user is ahead of GFT, the Time Variance will show a time with positive (+) symbol.
    • Required Pace: This key feature provides, at the end of each interval, the exact pace per remaining interval that the user must adhere to (or exceed) in order to achieve (or beat) their GFT.
      If the user is behind GFT, the Required Pace will show a pace per interval that be will faster than the current pace. Conversely, if the user is ahead of GFT, the Required Pace will show a pace per interval that be will slower than the current pace.
      Other:Both the ETA Mode and Chronometer Modes show, near the top of the screen, the "Goal Finish Time" (GFT) and "Target Pace" (TP) that the user inputted prior to the start of the event. These numbers are static and do not change during the event. They provide a useful reference should the user want to remember what they inputted for these data points as well as to compare to the ETA and actual pace throughout the event.

    Chronometer Mode:

    • Intervals Completed: This shows the number of intervals completed. Intervals are shown in tenths of an interval.
    • Total Time: This is the total elapsed time from when the start button was pressed.
    • Current Interval: This shows the amount of time elapsed for the current interval only. This restarts at zero at the completion of each interval.
    • Pace: This is key function that utilizes the smoothed average pace calculation (see below) and is a key component to the ETA calculation. This is NOT Current (instantaneous) Pace shown on the ETA Mode screen.

Pausing/ Resuming the Event

  • To pause the event, press the "Pause event" green bar at the top of the screen. A pop-up screen will say "Do you want to pause the event?" If "Yes" is chosen, the event is paused and the green bar will now say "Resume event." If "No" is chosen the event will continue without interruption.
  • To Resume event, press the "Resume event" green bar. A pop-up screen will say "Do you want to resume the event?" If "Yes" is chosen, the event will then start again and the green bar will show "Pause event" again. If "No" is chosen the ETA App. will remain in Pause mode.

  • At the end of an event, choose the green bar at the bottom of the event page labeled "Mark it finished." A pop-up asking the user "No/Yes" will appear. Choose "Yes" if the event is completed. If "No" is chosen, the event will continue without interruption.
  • After "Yes" is chosen to complete the event the following pop-up sign will appear: "Event has been finished successfully." Hit the "OK" key to confirm.
  • The event will now be listed in the "Completed Events" along with the other completed events.
  • To access the post-event data, go to the home screen, choose "Completed Events" and choose the event you would like to view.
  • Once chosen, the event data will provide:
  • Event Name
  • Event Date
  • Event location
  • Number of Intervals
  • Goal time to complete the event
  • Actual time to complete the event
  • Time variance between goal finish time and actual finish time
  • A table showing the time (pace) for each interval completed
  • The Event Details page also has a line graph display of the event showing the time (pace) per interval. The graph page be viewed by pressing the "<" icon in the far upper right.
  • The graph page also has a ">" icon in the upper right. If the icon is selected, an email with the graph attached in a PDF format will appear. Thus the graph can be emailed to the user, others, etc. and be saved to a PC or other device.
  • Go to the home screen.
  • Select "Completed Events."
  • Choose the event that you want to re-create.
  • In the middle of the resulting page is a blue calendar icon. Press this icon and the application will show the user the "Create Event" screen populated with all the same data as the previous event except for the date. For the user that (e.g.) has a favorite training event that they repeat frequently, this is a convenient feature that allows the exact same data to be entered again except for the date which must be entered. This saves time and reduces data input errors.
  • Deleting Completed Events (Home Screen)
    • Slide the chosen event to the left and hit "delete"
  • "Look-Back" Intervals Defined
    • The ETA App. uses "average pace" of the selected number of prior ("look-back") intervals as a key part of the ETA calculation. This average pace is found in chronometer mode labeled as "Pace." This pace is the collective, average pace of all the chosen number of look-back intervals. This average pace and the ETA calculation is refreshed at the end of each interval. The number of look-back intervals will remain the same throughout the event with the exception of the initial intervals. Specifically: For example, using four intervals to calculate the average pace, at the completion of intervals 1 through 4, the average pace will use the pace for interval 1 for interval 1, then the average pace for intervals 1 and 2 for interval 2, then the average pace of intervals 1, 2 and 3 for interval 3, etc. until four intervals are reached. At the completion of (e.g.) mile 8, the average pace ("Pace" in the Chronometer mode) is the average pace of miles 5, 6, 7 & 8. At the completion of mile 9, the average pace is the average pace of miles 6, 7, 8 & 9, etc.
  • We suggest that the user selects four as the number of look-back intervals to start with as many endurance athletes with which we consulted frequently agreed with this number. However the user select any number look-back intervals up to the total number of intervals chosen.
  • ⦁ By using a continuous, smoothed average pace (and NOT instantaneous pace which is largely not useful or accurate when calculating estimated finish times) derived from a consistent, pre-selected group of just-completed intervals, the result is a much more accurate predictor of future performance and thus a more accurate ETA.

ETA Defined

  • ETA = (total elapsed time for total intervals completed) + [(average pace for the prior four* intervals) x (number of remaining intervals)]
    * four intervals is the number of "look-back" intervals used here as an example. The user can select any number of intervals up to the number total number of intervals chosen. The ETA App. will calculate the ETA at the completion of each interval.
  • The ETA App. is fully compatible with the Apple Watch.
  • Select the "Watch" icon (not the Cheetah Timing icon) on the iPhone’s main screen.
  • Select the Cheetah Timing icon
  • Slide to the right (green/ on) both buttons for "Show the App on Apple Watch" and "Show In Glances"
  • Sync the Apple Watch with the ETA App.
  • All functions of the ETA and Chronometer Modes are now also on the Apple Watch screen.Toggle back and forth between the two modes by pressing either mode (two bars at the top) in same manner as the iPhone.
  • To pause an event, press the "II" button which will revert to a start, triangle button. To resume, press the start button. Please note that, unlike the iPhone screen, there will be NO pop-ups asking again if you want to pause or resume the event.
  • To finish the event, press the finish (square) button.
  • Please note that, unlike the iPhone screen, there will be NO pop-ups asking again if you want to finish the event. Once pressed, the EVENT WILL BE FNISHED AND CANNOT BE RESTARTED. Thus be careful if using the Apple Watch to start, pause/ resume or finish an event.
  • On the Apple Watch’s Home Screen, like the iPhone, it lists both the Active and Completed Events from which the user can choose an event to view the event details.
  • As described above, if selected, the Apple Watch will also ring and vibrate at the end of each interval to notify the user. We recommend that the user select this function to be aware of when they complete each interval to confirm their pace, ETA, Required Pace & other key data to meet or exceed their goal finish time


The ETA App., with its unique ETA and Required Pace and other key data feedback features, allows the user to "dial in" their pace EARLY & precisely which results in optimized energy management & PERSONAL BEST FINISH TIMES!


From Your Friends at the ETA App. Team at CheETAh TimingTM