What do you do when the pressure tracking feature, Notification, History Graph does not work?

• Enable the  “Pressure tracking” option.
• Enable the “Exact update interval” option if you are a paid user..
• Turn on “Background App Refresh” in iPhone/iPad Settings for both Wifi & Cellular Data and allow for the “Barometer Plus” app. And the last enable network connection
• Add a widget for iOS 14 and later.
• Open the app at least twice a week.
• When “Low Power Mode” is enabled or the battery is below 20%, the app will not work.
• Remember to open the app once every time you reboot your device or after an OS update.
• Email us at: support+barometer@pvdapps.com, we could not read and reply to all the reviews on the App Store, so email us first.
• You can also check our demo video here: https://www.youtube.com/watch?v=Q1LqhKlRLqg

I - MAIN FEATURES

All your air pressure data stays and processes on your device, we do not use any cloud service to collect it. The location data is only used to get the nearest airport and it is not collected.

1, The main page

Primary gauge is the analog style like an aneroid or mercury barometer.

Secondary gauge is the analog style of altimeter.

• At the top is the value of station air pressure (by default) or adjusted mean sea level value (You can change in the app Settings, “Pressure Calibration” and check “Mean Sea Level Pressure” and set the “Reference altitude”). It also displays a pressure trend icon if 3 hours data is available.
• At the bottom it display your location altitude, temperature and humidity (only if you enable location permission for the app)
• Weather icons on the primary disk: the short term weather forecast from your barometer data (next 12 or 24 hours), it displays only after collecting more than 3 hours of data. It will use additional wind direction from the cloud if available. Only available if an icon changes color to green. Please note that this is not the current weather condition.

2, Notification and Pressure tracking

The core feature of the app is the “Pressure tracking” feature, you must enable the feature for “Notification” and “History Graph” feature work. The “Pressure tracking” works best with the “Exact update interval” option enabled.

“Notification” feature you can access from the menu, by default the “Weather changes notification” enabled. You can also create your own rules for your needs.

To use the feature the “Pressure change notification” option must be enabled.

It have many rule for use:

• Fall rule
• Rise rule
• Steady rule
• Greater than rule
• Less than rule

Some examples:

• You want to know when the air pressure greater than 990 hpa: Press Add button then choose under “Condition 1”, “When air pressure”, choose option “greater than” then enter 990, if you want to use MLSP value then check the option “Use adjusted Mean sea level pressure”, then customize you message and ringtone, press Save button then close the edit page.
• You want to know when the air steady for fishing: Press Add button then choose under “Condition 1”, “When air pressure”, choose option “steady” then enter 3 (you can enter 3.5 for 3h30m), then customize you message and ringtone, press Save button then close the edit page.

3, My Area

My Area allows you to define your frequent stay places, and the app tracks air pressure with location data. Each location has its data, and it helps you group the graph or history.

It also helps reduce the wrong alert about air pressure change and weather when you move to another location. You can also set reference altitude for each place, the app will use it for mean sea level pressure display and short term weather forecast.

The steps for use the feature:

• First you check the option “Enable My Area feature”.

• You tap the Add button to add a place, choose your location by selecting on the map or choose a nearby place and tap OK to save it.
• You can tap on the saved place to see details and customize it like change the radius of the place or the “Reference altitude”. The reference altitude here will override value in the Settings in “”Pressure Calibration”.
• From the moment you save the place, the app only collects air pressure data in the radius you set.
• You can add as many places as you like, but remember not to overlap the other places.

4, History Graph and History

Like the name, it only displays values collected in the background or foreground but not the real time value from the device barometer ’s sensor. You can select the area and the range of the data like 12 hours or 7 days.

5, Home Widgets

You can add a widget to the home screen, it only displays air pressure and calculated altitude.

After you select the widget, You can customize it in the Widget Settings.

II - DEFINITIONS

1, STATION PRESSURE

This is the pressure that is observed at a specific elevation and is the true barometric pressure of a location. It is the pressure exerted by the atmosphere at a point as a result of gravity acting upon the "column" of air that lies directly above the point. Consequently, higher elevations above sea level experience lower pressure since there is less atmosphere on which gravity can act. By default the app will display this value.

2, ALTIMETER SETTING, QNH

This is the pressure reading most commonly heard in radio and television broadcasts. It is not the true barometric pressure at a station. Instead it is the pressure "reduced" to mean sea level using the temperature profile of the "standard" atmosphere. The altimeter setting is the pressure value to which an aircraft altimeter scale is set so that it will indicate the altitude (above mean sea level) of the aircraft on the ground at the location for which the pressure value was determined.

QNH is the mean sea level pressure on your nearest airport, used to calibrate the altimeter.

3, MEAN SEA LEVEL PRESSURE (MSLP)

This is the pressure reading most commonly used by meteorologists to track weather systems at the surface. Like altimeter setting, it is a "reduced" or “adjusted” pressure which uses observed conditions rather than "standard" conditions to remove the effects of elevation from pressure readings. This reduction estimates the pressure that would exist at sea level at a point directly below the station using a temperature profile based on temperatures that actually exist at the station.

III - DETAIL SETTINGS

1, Display Settings:

• Housing color, Disk color, Needle, Background: Customize your Analog style barometer on the main app.
• Widget theme: Customize the widget background.
• Display marker needle: Display an orange needle on the main app, this needle is used to mark the pressure value for easier know it up/rise from the mark value. To change the value, touch 1 of your fingers on the disk, swipe up or down until it indicates the desired value.

2, Barometer Settings:

• Offset sensor values: used to calibrate raw sensor value, for example you see it differ from real value 1 hpa (when “Mean sea level pressure” off), enter -1 hpa to this option.
• Mean sea level pressure: pressure adjusted to sea level, not the actual local atmospheric pressure. When this option is ON you must provide “Reference altitude”, this is your current altitude, this value does not affect the altitude displayed in the main app screen. You can change this value until the main app displays the value that matches the QNH value automatically obtained by the app.
• Reference altitude from GPS: app will get “Reference altitude” from the GPS, best is turn it on for some minute and then turn off.
• Reference altitude: for app calculate pressure adjusted to sea level. You can find the accurate ground altitude value in Google Maps or http://elevationmap.net/

3, Altimeter Settings:

• Altitude from GPS: app displays altitude from GPS satellite. If this option off app will approximate calculate altitude from the air pressure read from device sensor and QNH value
• Relative altitude:  with this feature you can use it to measure how high of a building. Reset to 0 at the ground, go to the top of the building and it will display the height of it.
• Sea level pressure (QNH): “atmospheric pressure adjusted to sea level” or atmospheric pressure adjustment of “Mean sea level pressure”. This value is used in aviation. If you turn on GPS, internet connection, the app will automatically get from the nearest airport. More accurate this value, more accurate in altimeter.
• Auto update QNH: QNH value can be automatically updated in the background, even when you turn off GPS. But when you turn off GPS, enter the ICAO airport code of the nearest airport in the “Set nearest airport code” option.
• Auto update QNH interval: interval for automatically updating QNH.

4, Pressure tracking:

Note that the “History Graph” page only displays the pressure value of “Pressure tracking” in the background, not the pressure value in the real time.

This feature can send you notification about pressure change (weather change, altitude change) or even be used to track migraines from many of our customers.

• Pressure tracking: Automatically track air pressure change, record to database and send notification.
• Pressure tracking interval: interval for pressure tracking. For the exact "Tracking interval" please check the "Exact update interval" option."
• Pressure change notification: option to turn on or off notification when pressure change
• When pressure change more than: the option mean itself, you can use negative or positive value, unit in mb or hpa

4, Exac update interval:

• “Exact update interval” requires location updates in the background. If this option turns off or the location update in the background is disabled, the update interval will not be exact, it depends on the system "Background App Refresh".

If this option turns off, by design Apple iOS only runs background refresh tasks for about 15 minutes to 30 minutes without warranty.

You must meet all below condition to run background refresh (for pressure change and graph feature):

- Background app refresh enabled.

- Open app at least 1 a week

- Phone has network connection and data connection enable for the app

- Phone is not in low power(< 20%) or Low Power Mode

If this option turns on, the app will continue to update location  in the background and it will use more battery. Current version will use about 20 - 30% battery a day with the 10 minute interval.

When you press home button it will display a blue banner show that "Barometer Plus is using your location", if you don't want to see it, open iPhone Settings app,

choose Privacy and then Location Services, choose Barometer Plus and then select Always. In the Settings of the app, you will find an option to set intervals  for pressure and QNH update.

When this option is ON, “Pressure tracking” will always work with the interval you choose.

5, Other options, they are very easy to use and name themselves functions.