My GoPro camera is not listed, is it compatible with the Alti-Force Sensor Pack?

Only camera models listed on the compatibility tab of the Alti-Force Sensor Pack details page will work with the sensor pack.  If your camera model is not listed, our software is not compatible.  Please check back for future updates.

My computer does not open the installer program, what should I do?

You must have Java™ installed on your computer to open the installer. If you are not automatically prompted to install Java, visit to download the latest free version.

Also, be sure you have extracted, or un-zipped, the installer file to the memory card’s root directory (required on Windows).  The file name should end with “.jar” not “.zip”.

Is deleting everything on the memory card the same as Formatting it?

Deleting only erases files from view, while Formatting will erase existing files, prepare the memory card for new files, and may also repair corrupted memory sectors.  Formatting the card in the camera also creates folders and files used in camera operation and during Alti-Force installation.

My camera does not appear to accept an update, what should I do?

Be 100% sure the correct camera model is selected in the installer!
It is highly recommended to use a memory card that was recently used or formatted in the camera to be updated.  Doing so will allow the installer to auto-select the correct camera model.

Next, be sure you have extracted, or un-zipped, the installer file to the memory card’s root directory.  The file name should end with “.jar” not “.zip”.  If you used a sub-folder, the installation will not work.  Move the installer to the main directory of the memory card and run it again.  After running the installer program, you should see a folder named “Update”.
Important: properly eject the memory card from the computer!

If the camera does not begin the update with the standard method above, you may try resetting the camera by following these steps:
1. Remove card and battery, wait 5 seconds
2. Insert battery, wait 5 seconds
3. Push and Hold record button, then Press and Release power (mode) button
4. Wait until camera fully powers on, then release record button
5. Turn camera off

Now re-try the update.  Start by re-running the installer on the memory card.

How can I choose which subtitles I see on the video?

The settings.txt file on your memory card determines which subtitles are saved for playback. You can manually alter the settings.txt file with a computer, but it is recommended to use the Settings App.

Run the Settings App:
On a computer, open the file named “Settings.jar” stored on your memory card.  Select the desired options then click ‘Save’.  Properly eject the memory card from the computer before removing it.

I can’t find the Settings App on my memory card, where is it?

The file named “Settings.jar” was saved on your memory card in the main (root) directory when you installed the camera software. If you deleted it, or formatted your card, you can download another copy from the Downloads tab of the Support page.

How can I offset the altitude to show zero feet/meters at my current location?

Push the front button to change the camera mode until you see the setup screen (gears or wrench), then push and hold the top select button until the top LED starts flashing red then release the button.  The altitude is now set to zero and the offset from mean sea level (the universal reference as zero altitude) is saved on your memory card in the file named “alt_offset.txt”.

How can I reset the altitude offset to standard altitude (above mean sea level)?

From a computer: use the Settings App (run settings.jar) on your memory card to enter an offset value of zero (0) then click save, or you can simply delete the file named “alt_offset.txt” from your memory card.

From the camera: the only way is to delete everything, including videos, by formatting the card (delete all).

Can I use ‘One-Button’ or ‘QuikCapture’ mode?

QuikCapture = Yes!  (Hero4)
Available only on Hero4 running Alti-Force Software v2.11+.
The first few seconds of video will display dashes “–” followed by correctly synced data for the rest of the video.  The CSV data file will omit the missing data points and begin filling in rows of data with the first recorded timestamp.

One-Button = No.  (Hero3 & Hero3+)
The sensor pack needs a few extra seconds to initialize after camera power-up before recording can begin. The subtitles will be out of sync from video time if the video recording is started too soon after the camera is powered on, or after the previous video recording was stopped (the sensor pack data needs a few seconds to be saved before the next video recording starts).
See also “Why did the subtitles end before the video ended?” under FAQ ‘Playback’ section, or the Operation tab of the sensor pack details page.

How do I watch my videos on a TV?

Connect the camera to the TV with a USB cable (HDMI or other cables will not work to display subtitles), then change the TV’s input to USB mode.
If your TV asks what files you want to view, select all videos and choose the one to watch. (If ‘videos’ is not an option, the TV is not compatible)
Otherwise, manually select the “DCIM” folder, then the most recent videos will be stored in the folder starting with the highest number (e.g. 100…, 101…), select that folder, and finally choose the video to watch.
The videos are the files ending with .MP4, again with the most recent video having the highest number.

My video with Alti-Force looks screwy and has artifacts!

This has been reported a few times, and the cause of playback distortion has been traced to the player or computer.  The small addition of subtitle data can push a marginal computer beyond its ability to smoothly play the video (even if video played fine before using Alti-Force).

In VLC media player, try slowing the playback speed to half or slower.  In most cases, the video will play smooth again, indicating the video with Alti-Force was recorded without error.  In other cases, memory cards have been the culprit, especially the 64GB sizes.  View the Compatibility tab on our sensor pack details page for more reference information and a link to an article worth checking out.  Formatting the memory card in the camera is a possible corrective action, as well as good periodic maintenance.

Subtitles don’t show up on my TV, what am I doing wrong?

You may have subtitles disabled on your TV.  Check the TV’s settings,  referencing the manual, if necessary.

Verify you have connected the camera to the TV with a USB cable (HDMI or other cables will not work for subtitled playback), then change the TV’s input to USB mode.
Note: USB mode should work after installing our software on your camera (except select Hero3+ Black software versions, see Compatibility tab).
If your TV does not have a USB input, or only plays photos, the TV is not compatible and you must watch the videos on a computer or other compatible player.

Subtitles don’t show up on my computer, what am I doing wrong?

Verify the .MP4 video you are watching has the same-named subtitle file ending in .SRT saved in the same file folder.  If you copied or moved the .mp4 video from your memory card, you must also copy/move the .srt subtitle file with it.  If you renamed the video file, be sure you also renamed the .SRT subtitle file.

Also check the settings of your player, and verify subtitles are enabled.  If you cannot enable subtitles, try a different player.  VLC Media Player is known to be compatible with SRT subtitles on all operating systems.  Also, this plug-in might help users with Windows® Media Player.

Can I see subtitles on the camera’s screen or while streaming video to my phone?

No.  Subtitles are visible only when played via USB mode or card reader on a player compatible with SRT subtitles.  Subtitles are not visible on-camera or streaming playback from camera.

Playing directly on phone
Some mobile devices have SRT subtitle compatible players. You may try inserting the memory card in the mobile device or phone, or downloading both the MP4 and SRT files to the phone from the camera over Wi-Fi.

Advanced: Download via camera’s web client
With phone connected to (Her04) camera over Wi-Fi, open a web browser and enter address “”  You may then select “DCIM” folder and the subfolder containing the desired video.  Download (not open) the video MP4 and SRT files to the phone (long press or similar action to select download).

Can I change the subtitles after I record a video?

No. Our software saves the subtitles as soon as the video recording is stopped.  The subtitles are generated on camera based on the settings.txt file stored on the memory card at that time.  Changing the options in the settings.txt file will affect subtitles of subsequently recorded videos only.

Optionally, the CSV sensor data file or GPX format GPS mapping files may be used with DashWare at any time to generate visual gauges of your choice.
Note: the GPX files are available only when using the Alti-Force GPS mobile app paired over Wi-Fi with a Hero4 camera during video recording.

Why did the subtitles end before the video ended?

Most likely the video recording was started too soon after the camera was powered on (One-button or QuikCapture* modes cannot be used), or too soon after the previous video recording was stopped.
In each case, the sensor pack needs a few extra seconds to initialize or save previous data before recording can begin.
Note: in this scenario, the data is out-of-sync with the video.  All data is time-shifted by an unknown and variable duration, so corrections cannot be made with full accuracy.
See also the Operation tab of the sensor pack details page.

*QuikCapture for Hero4 cameras only is supported with Alti-Force software v2.11+.  In this mode, the first few seconds of video will display dashes “–” in the subtitles until the sensor pack data is synced with video.

Why do I see connection errors from other apps on my mobile device?

While Wi-Fi is connected to the camera, Wi-Fi access to the internet is not possible (through the camera). Other mobile apps that try to sync or access the internet through Wi-Fi may show connection errors or simply not work until they regain data access on a regular (non-camera) network.

The Wi-Fi status displays “Not a camera”, how can I connect to my camera?

You need to increase the priority of the camera network, or remove the other network.

In the Wi-Fi settings of the mobile device, select the option to ‘manage networks’.  Find the network name of the camera and move that network to the top of the list (high priority).
The mobile device will first try connecting to the camera, now being set to a higher priority, as soon as Wi-Fi is turned on.

After setting the camera’s network to high priority, turn off the mobile device’s Wi-Fi then turn it back on.  The mobile device will automatically connect to the camera’s Wi-Fi network (camera Wi-Fi must be on).

Alternatively, choose to ‘forget network’ for all higher priority networks above  the camera network, or manually select the camera network in the mobile device’s Wi-Fi settings.

Why does the top LED on the camera flash blue?

The top (and bottom) LED will flash blue once for every new GPS data packet received, only while the camera is in standby (not while recording).  If the LED is not flashing, the mobile device may not be connected to the camera or may not have GPS lock.
Note: the ‘4 LED’ option must be selected for the top LED to flash blue.

The blue LED on the front of the camera is unchanged from factory function, it does not indicate status from the Alti-Force GPS mobile app.

Does the Alti-Force GPS mobile app show me the camera’s mode or recording status?

No.  The Alti-Force GPS mobile app provides the capability to start and stop recording over Wi-Fi, but there is no feedback from the camera to indicate what the camera is doing.

Bonus: the REC button will also work in picture modes as the shutter button to take a picture.  You don’t even need a Sensor Pack to do this!

Can I use Alti-Force GPS mobile app with a camera other than a Hero4 Black or Silver?

No.  The Alti-Force GPS mobile app can only communicate with the Hero4 Black or Silver editions.

Why are GPS-based subtitles sometimes missing or displayed as dashes or negative values?

If the mobile device does not have a GPS lock when video recording is started, all GPS-based subtitles will be excluded from display until the first GPS data packet is received during that video recording.

If the mobile device loses GPS signal for a few seconds, the subtitles will indicate this with dashes.  Some iOS devices can report negative values from their GPS when signal is intermittent or quality is low.

What is the rate and quality of GPS data coming from the mobile device?

Most mobile devices capture GPS data once per second, so this is also the approximate rate at which the data will appear with Alti-Force Sensor Pack data.

Every device manufacturer internally sets the GPS to report data to mobile apps in their own way, which may have errors.  As such, the quality of GPS data is independent of the Alti-Force GPS mobile app and may vary by device manufacturer and in cases of poor GPS signal or accuracy.

How does the Alti-Force Sensor Pack work to show subtitles?

The sensor pack contains absolute pressure and acceleration sensors.  Our software in the camera reads several measurements each second from those sensors and saves them in a data file, as well as in the .SRT subtitle file format.  Many TVs and video players recognize the .SRT subtitle format and display the subtitle data, just like watching a subtitled movie.  The optional data files can be used for data analysis by advanced users.

The camera’s top LED is flashing, what does the pattern mean?

The top LED (next to the start/stop recording button) will flash red 3 times to indicate the sensor pack is ready.  The “ready flash” is seen after powering on the camera, usually within 10 seconds, and also after a video recording is stopped.  Wait for the 3 red flashes before recording is started.

The top LED will quickly flash red 10-20 times if the sensor pack is NOT detected, usually within 10 seconds after powering on the camera.  If this happens, the Alti-Force software shuts down and does not check for a sensor pack until the next power cycle.  This may also be seen upon turning on Wi-Fi, inserting a memory card, or pushing any of the buttons while the camera is powered off.

If the top LED flashes red with any other pattern, please send us a message through our contact page.

If using the Alti-Force GPS mobile app, the top LED will flash blue each time a new GPS data packet is received over Wi-Fi (during standby only).  Also, all ‘4 LEDs’ must be enabled to see the blue LED flash.

Do I really need to use a skeleton housing for the camera with the Alti-Force Sensor Pack?

Altitude is determined by measuring changes in air pressure, so a waterproof (air-tight) case would not allow for accurate sensing of altitude changes.  The skeleton case is the easiest solution, but alternate options are available.

A modification is available to replace a button in a waterproof backdoor with a water-resistant air vent (see procedure here).  Also available is the ready-modified vented accessory backdoor product.

The altitude doesn’t show zero, but I reset the offset yesterday. Why?

Altitude is based on atmospheric pressure, which changes often with weather, especially if storms have been or will be nearby within a day or two.  To show the most accurate altitude, reset the altitude offset just before recording video.

What is the difference between altitude MSL and AGL?

Mean Sea Level (MSL) is the average water level of the ocean, or seas, between high and low tides.  Since this is the same level world-wide, it is referenced as a zero point for height measurements requiring a standard/known zero point.  Height above MSL is used to describe altitude of airplanes, elevations of hills and mountains, and anything else requiring a standard reference point.  If a local zero point or ground level reference is used, heights above this point are called altitude Above Ground Level (AGL).

Does the Alti-Force Sensor Pack measure altitude in MSL or AGL?

Both.  If you set the altitude offset to zero, this is the same as altitude MSL.  If you enter any other offset value, altitude is referenced to your entered value.  When setting the offset value equal to MSL “ground level” in your local area, the resulting altitude is above ground level or AGL.

Why does the altitude change so quickly?

The altitude you see is calculated from the air pressure measurement at that moment in time.  Due to air turbulence, the pressure changes can be inconsistent, causing the calculated altitude to be displayed in unexpected ways (such as seeing a momentary increase in altitude of a free-falling skydiver).  As a rule of thumb, the slower the camera with sensor pack is moving through the air (less turbulence), the more accurate the altitude will display.

A smoothing setting is new with software version 2.0 that can be used to filter out some variations in the displayed values.

Why does the G-force change so quickly?

The G-force you see is the actual measurement at that moment in time.  If you see a large change, it is real!  It is common for a camera mounted on a helmet to show changes of a couple G’s as the person moves their head, especially for quick head movements.

A smoothing setting is new with software version 2.0 that can be used to filter out some variations in the displayed values.

Why does the temperature show higher than expected?

The temperature sensor is integrated into the pressure sensor, so you are seeing the temperature inside the sensor pack.  The heat generated by normal use of the camera will warm the sensor pack more than the outside air, and the result is a higher temperature measurement.

Can I use the Alti-Force Sensor Pack while SCUBA diving?

It is not recommended.  SCUBA diving requires a waterproof case, which prevents the sensor pack from measuring altitude.  The sensor pack does not measure depth, and underwater accelerations are not likely to be useful.

Can the Alti-Force Sensor Pack display speed subtitles?

Vertical descent speed can be calculated separately.  Since it is derived from pressure-based altitude calculations, vertical speed would fluctuate too widely for a consistent speed display.  Custom solutions are available upon request.

Horizontal ground speed is new with software version 2.0, and requires using the Alti-Force GPS mobile app.  Speed can be displayed as miles or kilometers per hour.  Distance and direction values are also available.

A new update for my camera was just released, should I update?

Performing an update from the manufacturer will remove our software and you will not be able to use the sensor pack.  When manufacturer updates are released, we will make all efforts to update our software for compatibility within a few weeks, but we cannot guarantee forward compatibility.  We will announce new software updates when they are available.   Until then, we recommend not to update your camera.

How can I remove the Alti-Force Sensor Pack software from my camera?

The camera will continue to function normally without the Alti-Force Sensor Pack attached, so an uninstall of our software is not necessary except before performing a factory update to the camera.  To uninstall our software from the Hero3 Black and Hero3+ Black, download the uninstaller program on the support page then run it on your memory card. For the Hero3+ Silver and Hero4 Black or Silver, our software can be uninstalled from the camera by performing the normal factory update.