GPS2IP

GPS2IP can push the GPS data to any IP address, using either TCP for a connected session, or UDP for a faster, lightweight method.

Go into the settings, and under Connection Method, select either TCP Push or UDP Push.
By pressing the settings button, you can check and modify the address the data is being transmitted to.

The address can be any valid IP4 adress, and also a URL such as heresaverylongurl.com
(http:// is assumed).

The Port number should be the port that the other machine is listening on.

More detailed setup instructions can be found here.

GPS2IP can be configured as a WebSocket Client, and connect to any online WebSocket Server to share location data using the latest WebSocket technology.

Websockets are particularly useful for building software applications requiring instant updates. In this way, you can share data from many GPS2IP Clients instantly.

For technical information, check out WikiPedia.

GPS2IP setup instructions can be found here.

GPS2IP can transmit both the NMEA & TAIP format navigation messages.

NMEA

NMEA Reference Document

Most marine applications use the industry-standard NMEA system.

TAIP

TAIP Reference Document

TAIP was designed specifically for vehicle tracking applications, but has become common in a number of other applications because of its ease of use.
Config TAIP

On the settings page, just select which option you prefer:

To save energy, GPS2IP can minimise the amount of data transmitted by selecting an appropriate transmission period for your needs.

The first option is No Delay, which means that data will be transmitted as soon as your device gets any GPS data.
If the GPS signal is strong, this could be every second.
If the GPS signal is weak - you may not get any transmission for seconds or minutes.
If your iOS device is running on the battery, consider slowing down the period from this setting to conserve battery life.

The next settings is 1s, which transmits every second if the setting Disable when Static is disabled.
The setting Disable when Static makes it possible to not keep receiving the same (or very similar) data when your device is staionary. If you are only interested in receiving data to show where the device has been (and don't care so much where it might be right now), then enabling this setting can save considerable battery energy if the device stays in one place for lengthy periods of time.

Other settings range from 5s up to 1 hour.
If you are drifting on a wind-blown raft after escaping a shipwreck - selecting 1 hour should be fine.
Aboard a modern ship, perhaps 5 minutes or 30 minutes would be better.
If used for navigation, 1s or 5s is recommended.

The ideal setting depends entirely on your requirements.

In an effort to minimise energy consumption, GPS2IP can use several techniques to determine the device location.
If you have your iPhone plugged into power, you can ignore this setting, and just go with 'The very best' setting.

Apple has defined the following values, from which you may choose.

GPS2IP setting	Apple says
The very best	Uses the highest possible accuracy and combine it with additional sensor data.
Pretty good	Accurate to within ten meters of the desired target.
Moderate	Accurate to within one hundred meters.
Lazy	Accurate to the nearest three kilometers.

If you select one of the lower accuracy-settings, the power consumption can be dramatically reduced.
(The GPS uses a lot of power!).

Standard GPS devices output the NMEA format.
Here is a document with details of some common NMEA messages.

GPS2IP outputs a subset of these messages, as apple devices do not have the sensors to determine much of the information required to construct valid NMEA sentences.

The available sentences (with provisos detailed) are:

• $GPGGA
  Horizontal Dilution of Position is hard-coded to 0.9
  Number of satellites tracked is fixed to 8
  Height of geoid above WGS84 ellipsoid is hard-coded to 46.9m
  
• $GPRMC
  Magnetic variation is fixed to 3.1°W
  
• $GPGLL
• $GPHDG
  Only on supported hardware with an electronic compass
• $PASHR Only on supported hardware with an electronic magnetomoter
  Heave is fixed to 0.0m
  Roll and pitch angle accuracy estimate fixed to 3.14159...°
  
• $GPTXT

Each of these NMEA sentences can be individually enabled and disabled.

GPS2IP can cantinue to operate in the background in several different ways.

If Operate in background mode is enabled, then you will continue getting data if

• GPS2IP is put into the background (by running another app)
• Your device sleeps after a period of inactivity

Even if powered-off (or the battery runs out), GPS2IP will restart automatically if Operate in background mode is enabled.

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If the setting Operate when terminated if enabled is enabled this works on an even lower level.

Normally, if you terminate an app by going into the 'Multitasking Manager' (by double-clicking the home button) and dismissing it by flicking upwards - that's it - it is killed, and will not run again until you click on the icon for the app.

However, if GPS2IP is running (enabled on the main UI page), and is terminated by this method with Operate when terminated if enabled enabled then if the device is restarted, GPS2IP will come back to life after a few minutes, and continue transmitting.
It will still be in the background, but will function as configured before power-off.

GPS2IP can communicate over several different networks.

Wifi  

Probably the easiest way to connect to your iDevice is over a wireless LAN (wifi).
If your iDevice is on the same network as your computer that you want to connect to is, it will be assigned an IP address similar to yours (perhaps 192.168.1.7, or similar).

You can check the IP address by selecting Wifi IP under Network Selection in the settings, and hitting the little

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Cellular IP  

This is the method you use to connect to the internet when out of range of any wifi network - when you're in the car, for example.

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Hotspot  

If you have a cellular connection in your iPhone, you can enable "Personal Hotspot" .
This means your iPhone will act like a wi-fi router, and you can connect to the new wi-fi network that it provides.

To set up Personal Hotspot:

1. Go to Settings > Cellular
2. Tap Personal Hotspot, then tap the slider to turn it on
3. (Make sure you leave wi-fi on, so that you can connect to the new wi-fi network!)

If you don't see the option for Personal Hotspot, contact your carrier to make sure that you can use Personal Hotspot with your plan.

Once you have enabled Personal Hotspot, when you select Hotspot in the GPS2IP Network Selection settings, you will be able to connect to it over wifi from any other device.

Be sure to check the Hotspot IP address by pressing the little next to the Hotspot selection.

   Warning

If HotSpot is operating, your data usage may be high if network access is required for anything connected to the device running GPS2IP. For example, Navionics syncs information, and can use quite a lot of data.
Please disable these features if you do not have a high data allowance.

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Bluetooth  

You can connect to GPS2IP with a device that uses BLE technology.

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GPS2IP provides the Location and Navigation (0x1819) service, with the following characteristics:

When the icon is flashing, GPS2IP is advertising it's services.
This means other devices can see it, and subscribe to the data.

If there is a problem, the Bluetooth system can stop advertising. In that situation, the icon will be greyed out .
You can press that icon to start GPS2IP advertising again.

Rather than configuring a destination for GPS2IP to transmit location information to another machine, GPS2IP can be operated as a network socket .

In this mode, GPS2IP waits until a connection is requested by some software, and then establishes a connection with that software/computer.
You may not need to know the details, but some navigation software will use this method to connect to a GPS source.

To enable this mode, select Socket in the Connection Method section, and hit the little button to verify or change the port that GPS2IP will listen to.
Your navigation software should have that port number information available.

If you would like to test that GPS2IP is functioning (with good reception and location data, for example), you can Telnet to your iOS device, and begin receiving data.
Make sure all the settings are configured appropriately to get data out for testing.
Check the Socket for the port number, and the under the selected network for the IP address.

In this example, the iPhone has an IP address 192.168.0.106 and is listening on port 1112.
Start up Windows Command Prompt, and start the socket connection with the following command

Microsoft Windows [Version 10.0.15063]
(c) 2017 Microsoft Corporation. All rights reserved.

C:\WINDOWS\system32>telnet 192.168.0.106 1112

$GPRMC,081656,A,5826.02896,N,02700.28502,E,0.00,0.00,140817,003.1,W*67
$GPGLL,5826.02896,N,02700.28502,E,081656,A*20
$GPRMC,081656,A,5826.02896,N,02700.28502,E,0.00,0.00,140817,003.1,W*67
$GPGLL,5826.02896,N,02700.28502,E,081656,A*20
$GPRMC,081656,A,5826.02896,N,02700.28502,E,0.00,0.00,140817,003.1,W*67
$GPGLL,5826.02896,N,02700.28502,E,081656,A*20

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More details here