11. Troubleshooting & Additional Help


Q1. “I downloaded MotionX-GPS but I’m having trouble launching the app...”

A1. If you are unable to launch the app, please see “Troubleshooting applications purchased from the App Store” by Apple®. The "Reinstall the application" section often addresses the issue.


Q2. “Why does the compass seem to work only when I’m moving?”

A2. For the iPhone 3G, or the 3GS compass in satellite mode, the compass on the MotionX-Navigation page acquires information from “orderly changes in position”. Steady directional motion improves accuracy. A sustained speed of a few mph or km/h is all that is needed to provide an accurate heading. In satellite mode (which is the only option for the iPhone™ 3G), at slow speeds, heading information is unreliable since it does not use a magnetic compass.


Q3. “Can I visualize my tracks in Google Maps from my computer?”

A3. You can use Google Maps to view your track by emailing the track to yourself, then you can view the track in Google Maps by either clicking the live link embedded in the email, which will be active for 7 days, or by importing the KML file into a new Map created under the "My Maps" link. If you have Google Earth installed, simply drag the GPX file onto the earth to see your track.


Q4. “Does MotionX-GPS require a cellular network?”

A4. The iPhone 4, 3GS and 3G iPhone™ uses an A-GPS (Assisted-GPS) chipset which uses cell tower triangulation to speed up GPS signal acquisition. Cellular coverage is not needed to acquire a signal, however the signal acquisition will be much quicker if you have data coverage. Without data services, it can take 15 minutes or longer to acquire a signal. This is simply because it takes longer to determine which satellites to use out of the 31 available around the world. With data services, it typically takes under a minute, but can take up to 5 min. You do need data services or WiFi if you want to share your waypoints/tracks via email or view a waypoint in Google Maps.


Q5. "Can a page be added to show satellite positions and signal strength?"

A5. We would very much like to add a satellite status page with satellite position and signal strength, however the iPhone™ API does not provide this information. The iPhone™ API currently provides a radius of accuracy.


Q6. "Why am I having trouble getting a signal?"

A6. First, make sure you are using an iPhone™ 4, 3GS or 3G. First generation iPhones and the iPod® touch do not have the necessary GPS chipset to acquire an accurate signal.

Ensure your iPhone™ has a clear view of the sky. GPS requires a direct 'line-of-site' to communicate with satellites. Your iPhone™ 4 3GS or 3G must have a clear view of the sky to locate at least three satellites in order to give accurate position information. If you are located indoors, or in a wooded area or urban canyon (surrounded by buildings), you may be unable to acquire an accurate signal.

If you can't acquire a signal within two minutes, try using "Reset Location Warnings" under the iPhone's settings in General >> Reset.

If you are flying or traveling at speeds above 150 mph/240 km/h, you may wish to switch the Accuracy Filter off under Settings > Global Settings if you are having trouble maintaining a GPS signal. Turning the Accuracy Filter off makes it easier to acquire and maintain a GPS signal when traveling at high speeds.

Alternately, try powering your iPhone™ off, then turn it back on and launch MotionX-GPS. If prompted, allow MotionX-GPS to use Location Services by selecting "Ok".

The iPhone™ 4, 3GS and 3G use cell towers to speed up acquisition of the GPS signal. While it typically takes between 1-5 minutes to locate a signal, it can take up to 15 minutes in areas where cellular coverage is not available.

The iPhone™ 4, 3GS and 3G also has a service by Skyhook which uses WiFi to help speed up the GPS signal acquisition. If the location data for the WiFi signal you're picking up is incorrect in Skyhook's database, it could be interfering rather than helping to speed up the GPS signal search.

Skyhook has a form you can fill out to correct the location of the WiFi access point. Here is a link to the form. You will need your actual Latitude and Longitude, the MAC address of the WiFi access point and your email address to submit a correction. The form has a link to show you where to find the MAC address if you don't know where to look.


Q7. "Are jail-broken iPhones compatible with MotionX-GPS?"

A7. Yes, our goal is to support all iPhone™ users. However, some jail-broken iPhone™ configurations and applications interfere with other iPhone™ applications such as MotionX-GPS. Some users have experienced trouble getting past the terms and conditions page of MotionX-GPS with jail-broken iPhones. Several users have indicated that removing a particular SMS application specific to jail-broken phones resolved the issue. Other users simply needed to update their iPhones with the latest jailbreak updates.


Q8. “What happens when a phone call comes in?”

A8. Apple® shuts down all third party apps when a call comes in. MotionX-GPS saves your current state, and once the call is finished, you are returned to where you were. Your stopwatch will still be running, and we will include the distance between the last point before the call came in and your current location. However, it will be calculated based on a straight line since the GPS signal is not available during a call.


Q9. “What is the best way to position the iPhone™ 4, 3GS or 3G in my armband while running to get the best possible GPS signal?”

A9. Below is a picture showing where the GPS antenna is in the 4, 3GS and 3G iPhone™. To receive the best possible GPS signal make sure your screen is facing out in your armband. If in the horizontal position, it is best to have the volume buttons facing up.

Antenna Location


Q10. “Does MotionX-GPS work when my iPhone™ 4, 3GS or 3G is in airplane mode?”

A10. No. When in airplane mode, the GPS chipset is disabled by the iPhone™. Third party iPhone™ applications cannot override or alter the airplane mode functionality to enable the GPS chipset. If you want to ensure network data is not used while using MotionX-GPS, remove your SIM card (the SIM is located in a slot on top of your iPhone™ -- you will need a narrow pin to pop the card out). The A-GPS (Assisted GPS) chipset in the iPhone™ is designed to use cellular or WiFi data to speed up the acquisition of your GPS signal, so you may need to wait 15 minutes or longer to acquire a signal if your SIM has been removed.


Q11. "I don't see my question in this FAQ page, how do I contact your support team?"

A11. Please submit your question to MotionX using the Send Feedback form.


Q12. “If I tether my iPhone 4 to my Wifi only iPad using the personal hotspot feature, will my Wifi iPad receive a GPS signal?”

A11. Unfortunately no. While there have been claims that one can obtain GPS location data by tethering an iPhone 4 to a Wifi iPad using the personal hotspot feature, this simply isn't the case. TabletMonsters.com posted a video showing what appeared to be location data passed from the iPhone to the Wifi iPad, but this claim has since been debunked by our own testing and others.

If you'd like to confirm this yourself, try the following. Setup the personal hotspot feature ($20/mo from AT&T) using Bluetooth to connect your Wifi iPad to the iPhone 4. Turn Wifi off on your iPad to ensure the location on the map isn't being updated using Skyhook's Wifi access point database. Launch the native maps app on the iPhone 4 and wait until you see the blue dot "ping". Your iPhone now has a GPS signal. While tethered to your iPad via Bluetooth, launch the native Maps app on the iPad. When the maps app is opened, a popup will state "Cannot Determine Location". So the iPhone didn't send the iPad it's GPS location data. If you turn Wifi back on, you'll see your approximate location updated on the native maps app on the iPad, but this location is simply your iPad looking up Wifi access points in Skyhook's database to determine an approximate location.


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