Which EOS GPS receiver to get?

Please refer to the comparison chart at the following link:



Do you have an app with enough accuracy to walk a property line, stake it and build a fence?

We have such apps for use on iPad and iPhone devices. The accuracy depends on the GPS receiver used.

The iCMTGIS PRO with EOS Arrow Gold or iSXBlue II+ GNSS is for performing a survey-grade job with high accuracy. This system has a high price tag. Consumer-grade GPS such as the Dual XGPS-150A or a Bad Elf GPS only claim 2 – 5 meter accuracy and are much more affordable.

I was wondering if it is possible to use the gps receiver built in to an iPad with the iCMTGIS Pro program?

Yes, you can use the GPS receiver built into an iPad with the iCMTGIS PRO app. Please keep in mind that the built-in GPS receiver of the iPad is not quite accurate. If you just want to record a rough position or to have the app lead you to the vicinity of a location to find a stake, that is fine. In that case, you could just as well use a lower-priced app like the iCMTGIS III.

iCMTGIS PRO distinguishes itself by being able to interface directly with a couple compatible high-precision external GPS receivers to obtain accurate results. Some of our customers are using such a system in their RTK GPS applications.

Some GPS/GNSS receivers compatible with iPad and iPhone devices

Recently Geneq Inc. announced their new SXBlue Platinum GNSS receiver.

As you know, the accuracy of the work performed using an iOS GPS/GIS app depends on the GPS receiver used. The assisted GPS provided by the iOS devices are not adequate for serious work that are based on accurate locations. External GPS receivers with much better precision abound, but only a limited number of them are compatible with the iOS devices. Following are links to information on some of the external Bluetooth GPS/GNSS receivers that can work with iPad and iPhone devices. Not sureprisingly, higher precision equates to a higher price tag.






Using iCMTGIS PRO and EOS Arrow Gold to collect UAV ground control point data

“I have a UAV company and do lots of inspections and mapping with my drones, when I am doing the mapping in the past I have hired crews with total stations to get me my GCP’s so now I want to do this myself. I get the X, Y and Z data from them so I can input them into my Pix4D software. I know your software allows me to collect the X and Y data but can I also collect the Z data accurately?  . . . . .  Please see the attached GCP information sheet I get from survey companies. As long as I can get this data it will be great.”

These appear to be the coordinates for Point Features. So, you will want to first set up the coordinate system and distance unit to use. If you are using UTM, select the proper zone.

Now create a new Point Topic and give it a name, such as GCP (for ground control point). Then Edit the GCP Topic and add the built-in Attributes: Position_X, Position_Y and Elev_Z as well as the GCP ID attribute.

With the GCP Topic selected, turn on GPS and record a few points. After ending the point data collection, you can turn on Sheet View and look at the data in a spread-sheet arrangement.

You can export the point coordinates and attributes data to Shapefiles or a text file.

As the GCPs are control points, you will need to use the Arrow Gold GNSS receiver in RTK mode to get better accuracy.

Under Setup – GPS, select “Enable the External GPS” and select the protocol for the EOS GNSS receiver. This way, you will be able to see the RMS error of the GPS data output by the GNSS receiver displayed at the top of the Map View screen.

10/14/16 Renting iSXBlue II GNSS or EOS Arrow receiver

“Although the buying price for the iSXBlue II GNSS is too high for our project, I did find a company in OH, that would rent it to me for a very decent price for a week.”

This user informed us that http://www.fondriest.com/ has iSXBlue II GNSS for rent. It looks like they also have EOS Arrow for rent.

If you have a temporary short project to do that requires the use of a higher precision GPS receiver, this could be a viable solution.

How to set up iCMTGIS PRO to work with EOS Arrow Receivers

A video is worth a thousand lines of text. 🙂