HSIWatch App for Android Watches

Always be skeptical regarding any information provided by HSIWatch. Accept it only if and when it is confirmed by navigation methods such as FAA approved chart visual references and FAA approved electronic navigation systems. EXPECT it to FAIL when someone's HeALTh or PROpeRTy is at RISk.

Do not use this app in IMC!

Privacy policy: The only personal information used by HSIWatch is location, which is used only for updating the display and optionally forwarding it to other devices, all at the user's explicit direction.

How To Install

The easiest way to install is by opening the installation web page on your phone then click the Install button, then select your watch when prompted. Do not use the Google Play Store App as it will not allow selection of your watch for installation. Show Details

If that does not work, this procedure can be used to install it on the watch via a PC connected to same WiFi network as the watch.

Page Map

Waypoint Entry
Nav Mode Select
Nearest Airport
Airport Information
start Nav Dial
Moving Map
... menu pages ...

Nav Dial Page

OBS setting ▶
course to waypoint ▶
course from waypoint ▶
distance to waypoint ▶
time to waypoint ▶
◀ ground track
◀ altitude
◀ ground speed
◀ waypoint ident
◀ navigation mode
  • OBS setting - where the yellow triangle is, indicating selected course or radial.
    • Drag finger around number dial to change OBS when in GCT,VOR,ADF modes
    • LOC,LOCBC,ILS modes lock the OBS in place
  • course to/from waypoint - indicates the OBS setting needed to center the needle
  • distance to waypoint - indicates nautical miles to the selected waypoint. Italics indicate slant-range distance (when elevation of waypoint is known), normal text indicates over-the-ground distance.
  • time to waypoint - distance / ground speed, ie, time to waypoint if headed directly to waypoint. --:--:-- indicates time in excess of 100 hours.
  • ground track - course line currently following over the ground as measured from GPS, same as red airplane icon. ---° indicates ground speed too low to determine track.
  • altitude - feet MSL as measured from GPS
  • ground speed - indicates ground speed in knots as measured from GPS
  • waypoint ident - waypoint being navigated to

    To select a waypoint, swipe downward on the nav dial page to open the waypoint entry page.

  • navigation mode - indicates current navigation mode

    To change navigation mode, swipe downward on the nav dial page to open the waypoint entry page.

To access the other pages, touch near the center of the screen, and a diagram will appear:

Swipe in the direction of the double arrows to select the function wanted:
  • exit - close the app (must be swiped twice)
  • map - open the moving map page
  • menu - access the menu pages
  • waypt - enter waypoint being navigated to
You must touch in the area of the menu to get the menu to appear. Touching near the edges will rotate the nav dial (if current nav mode allows it).

Waypoint Input

Navigation mode is selected with the radio buttons below the waypoint description text.

Valid for all waypoints: Valid only for localizer waypoints: Valid only for localizer waypoints with glideslope:

Menu Pages

  • ◀BACK - goes back to nav dial or moving map page
  • SATS - show GPS satellite status (also has a magnetic compass)
  • GPS - selects GPS source (see below)
  • UPDDB - select database and download updates (requires Internet access)
    • GREEN - database is up to date and will remain so for a few days
    • YELLOW - database is up to date but will expire soon
    • RED - database is expired
    • FAA (US only) - selects the FAA database, updated to current 28-day cycle
    • ourairports.com - selects the ourairports.com database. Be especially cautious when using this database. As a crowd sourced database, even a current version may contain outdated information! If you find inaccuracies, please inform ourairports.com so the database can be updated. In any case, please support ourairports.com if you use this database.
  • HSI - select HSI mode for nav dial (airplane always at top); else OBS with yellow triangle always at top
  • Ambient - slow to 20 seconds per GPS sample in ambient mode; else maintain 1 second per sample
    Note: Only applies when using internal GPS source. Retains same rate when using external GPS received over Bluetooth or WiFi.
  • Time Dots - display time received from GPS as dots around the perimeter of displays
    • RED dot indicates HOURS
    • GREEN dot indicates MINUTES
    • BLUE dot indicates SECONDS
  • USRWP - access user waypoint database (see below)
  • MORE▶ - goes to next menu page
  • ◀BACK - goes back a page
  • Fill Chin - has nav dial fill chin on devices with a chin (only present on devices with a chin)
    Filled ChinEmpty Chin
  • SEND - send location to another device using Bluetooth and/or WiFi (see below)
  • ABOUT - display version and database expiration information
  • EXIT - close app
  • RESET - reset settings to factory defaults and purge database

Moving Map Page

+ zoom out
  • GREEN - airports (up to 20 with longest runways)
  • CYAN - VORs (if not 20 airports)
  • YELLOW - range ring at half radius
  • MAGENTA - course line and destination waypoint
    Course line shown is always great circle regardless of mode selected for nav dial page.
- zoom in

The moving map page can be accessed by swiping right-to-left on the nav dial page.

To access the other pages from the moving map page, touch near the center of the screen and a diagram will appear:

Swipe in the direction of the double arrows to select the function wanted:
  • back - go back to nav dial page
  • menu - access the menu pages
  • near - access nearest airport selection page
  • rwys - display runway diagram for current airport

User Waypoints

You can enter waypoints manually by giving them a name and supplying the latitude and longitude.

Swipe up on the nav dial page to access the Menu page then click on the USRWP button.

  • NEW creates a new waypoint.
  • Click it, enter information then click SAVE.
  • The other waypoint buttons can be clicked to edit the waypoint.
  • A long click will navigate to the waypoint.
  • SAVE - saves the entered data to flash memory
  • GPS - sets the lat/lon boxes to the current GPS position
  • GO - navigates to the saved user waypoint
  • DEL - deletes the saved user waypoint from flash memory
Latitude and Longitude can be entered in any of these formats:
  • h d
  • h d m
  • h d m s
  • h is one letter N S E W to indicate hemisphere.
  • d is degrees (with or without decimals)
  • m is minutes (with or without decimals)
  • s is seconds (with or without decimals)
  • The numbers must be separated from each other by a space. You can use any number of decimal places for any of them.
  • N71.5 is the same as n71 30 is the same as N 71 30 0.00000

Voice Recognition

Voice can be used to input the waypoint identifier being navigated to on the waypoint input page. It can be selected by clicking the VOICE button on the waypoint input page. It recognizes the usual aviation prowords (alpha, bravo, etc) and the decimal digits (see table below).

NOTE: Some watches may not have voice input capability.

NOTE: This feature may require internet access to function. Usually displays a message indicating unable to connect to Google or something similar. Swipe the voice input panel away then click on the ident entry box to use text input instead.

  1. open the waypoint input page by swiping downward on the nav dial page
  2. tap the VOICE button, speech entry page should show
  3. tap microphone icon on speech page
  4. say prowords for the desired waypoint
  5. click checkmark icon

List of recognized prowords (other words are ignored):


Selects which GPS device is used.


Transmits GPS positions (either real or simluated) on Bluetooth and/or WiFi UDP to such as a tablet or phone based EFB app. Uses NMEA GPGGA,GPRMC messages to send GPS position reports.