How-to get good positioning accuracy for ALIS (iPhone and iPad)

Due to the global market evolutions, Trimble has discontinued the Trimble R1 - ALIS preferred device for location accuracy in the past.

However, there are other good alternatives for sufficient location positioning on iPhone and IPad native ALIS apps.

Positioning Options

	Compatible with	Positioning method	Accuracy	(pain)	(gain)
1	All iPhones  iPads with Cellular data	Using built-in GPS from the mobile device	15m	Inaccurate selection of assets is possible due to insufficient location accuracy.	No action needed
2	All iPhones All iPads ( with Cellular data running iOS 15 and up )	4G cellular data	4m	Needs a recurrent Payment for the (e) Sim or admin manual IP for Wifi network	no extra device easy updating of device
3	iPhone 12 and up iPad mini -  6th Gen and up iPad Pro 11 - 5th Gen and up	5G cellular data ( Advised)	2.5m	Needs a 5G Device Needs 5G coverage Needs a cellular (5G) subscription manual IP for Wifi network	No extra device needed easy updating of device
4	All iPhones and iPads	Bad elf Surveyor   Product discontinued	2.5  m	Hardware purchase needed Best mounted on wrench or shoulder	Small - easy in use Relatively cheap No yearly cost for correction service
5	All iPhones and iPads	Bad elf Flex (Extreme)	sub-meter	Expensive hardware purchase Not a good form factor for regulator maintenance ( good for surveys)	High-accuracy No yearly cost for correction service
6	All iPhone and iPads	Bad Elf Flex Mini ( Best alternative for Trimble R1 and Bad elf Surveyor)	1.5 horizontal, 3m vertical (CEP)	Under testing	Small - easy in use Relatively cheap Mobile app available
7	All iPhone and iPads	Bad Elf Flex Mini Extreme	sub-meter	Under testing	High-accuracy Mobile app available

How to use Cellular data for increased location accuracy.

1. Arrange a cellular data connection for the device and test the internet connection by accessing a webpage through your browser
2. *Optional* When using a local Router for iPad-iPhone communication connection
   1. Modify the Wifi settings when connecting to the ALIS local wifi network to have a static IP address as in  How-to fix iPad Offline/not synchronised/not connected to the internet
   2. The iPhone should now synch ALIS data through the Wifi and it's location and internet through the cellular data connection 
3. The Location accuracy of your device should now be more precise when using the ALIS mobile Apps and other location positioning services.

How to use the Bad-Elf with ALIS 

1. Turn on the Bad-Elf surveyor and optimise the clear sky visibility of the device
2. * First Time use * You can pair the Bad-elf Surveyor through Bluetooth with the iPhone or iPad as a regulator Bluetooth device ( first time pairing - next connections should be automatic) 
3. * First Time use * verify the Bad elf configuration in the Bad Elf app for optimal location correction: https://bad-elf.com/pages/achieving-high-accuracy-with-a-gnss-suveyor 
4. The iPhone location service will be taken over by the Bad elf Surveyor device and no further action is needed to use it with the ALIS application.

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