Can we purchase the least expensive iPad mini to use with iCMTGIS PRO?

iPad Mini will work fine with iCMTGIS PRO. A used iPad will be fine as well. As you are using an external Arrow GPS, you could get a WiFi-only iPad model, which is an iPad device with WiFi capability but without the built-in GPS.

Will Stakeout iCMT use the external GPS?

“I am using an iPad. Does Stakeout use the gps in the iPad or can it get it directly from the Arrow?”

When an iOS compatible GPS receiver is turned on and connected to the iPad, it will automatically override the built-in GPS to update CoreLocation. When you toggle GPS on in an app like Stakeout iCMT, the app will grab the position data from CoreLocation. In other words, the app uses the Arrow GPS data indirectly.

Of the various CMT apps, only iCMTGIS PRO provides the ability to get the GPS data directly from the Arrow and the iSXBlue GNSS receivers. In the “Enable the External GPS” mode, iCMTGIS PRO will read the NMEA data directly from these GPS receivers.

Really? You could use an iPod touch for GPS data collection?

Yes, provided you also get a compatible external GPS receiver to use with the iPod touch device. GPS receivers range widely in price, in keeping with the degree of precision they provide. A few expensive GPS receivers (such as iSXBlue and EOS Arrow) are available for renting for undertaking short-term work that requires sub-meter horizontal position accuracy.

Some companies employ multiple workers to perform GPS/GIS mapping and data collection tasks. Unless they already own iPhones, it will be more economical for them to run our iGPSGIS II or iCMTGIS III app on an iPod touch in conjunction with the external GPS receiver.


“I’m hesitant to spend $300 for the pro app if the $95 or $200 apps will suffice but I’m having a difficult time finding a comparison of features among the apps.”

Built-in Attributes 512x384

The three apps in the iCMTGIS-series all provide real-time GPS/GIS data collection and mapping functions. They will let you add user-defined Attributes for the recorded Features either manually or via a Feature List (attribute table). They will let you import and export Shapefiles. The differences are in the additional functionality provided by the more expensive apps.

If you just need to use GPS to map Points, Lines and Areas and record their associated descriptions, iCMTGIS II will do. iCMTGIS II can display the built-in Apple Map as background. If you would like to use an off-line geo-referenced background image, you will need to first use the optional PC-GIS software to convert the GeoTiff, GeoJpeg, ECW or MRSID files to the .pim file format. The .pim map can work in the “moving map” navigation mode. (Many of our existing customers already have the PC mapping software.) iCMTGIS II only works on an iPad device. Its iPhone equivalent is the iGPSGIS II app.

iCMTGIS III and iCMTGIS PRO can run on iPad and iPhone devices. These two apps will let you load a GeoTiff image or a .pim image as background map. They also provide a built-in Attribute List from which you can choose as additional Attributes for the Features. One of the screen shots displayed here shows the current list of built-in Attributes that you may elect to include in the data records for the Features recorded using GPS. Other additional functions are also provided in these apps, which help you stake points/lines/areas, create Features by entering distances and bearings, as well as classify, sort or perform a search on the Features in a Topic layer, import and export Point Features via a text file, etc.

GPS surveying using iPhone

GPS surveying using iPhone

iCMTGIS PRO has all the functionality of iCMTGIS III plus the Contour/Volume and Create Buffer functions. What sets it apart from the other two apps is that it provides the ability to receive the NMEA message stream directly from a few specific external GPS receivers. When the “Enable the External GPS” option is selected, iCMTGIS PRO will get the GPS information directly from the external GPS receiver rather than the iOS CoreLocation. This enables it to display a GPS status bar in real time.

At this time, EOS Arrow GPS receivers and Geneq iSXBlue II + GNSS can work in the “Enable the External GPS” mode. To use the EOS Arrow 200 and iCMTGIS PRO for RTK work, you must use the free EOS Tools Pro app to connect to the RTK network.

iCMTGIS PRO 1.0.1 released

You might call iCMTGIS PRO the Cadillac of our iOS apps. This app builds on iCMTGIS III and provides Contour – Volume functionality as well as the ability to read the NMEA stream from a number of “External GPS” receivers, such as the Dual XGPS-150A, the Bad Elf and the EOS Arrow.

“External GPS” refers only to those GPS receivers for which the app can parse the NMEA messages. To use any other compatible external GPS, please turn off “Enable the external GPS” check box under GPS setup.

After you have turned on “External GPS” and the GPS receiver is able to compute a position, the app will display a GPS status indicator, such as N3D3, which indicates that the GPS is providing 3-dimensional position and that the PDOP is 3. You will also be able to view the Satellite Status and position errors.

The iCMTGIS PRO and Arrow 200 combo is well suited for doing RTK GPS data collection using the correction data from a RTK network. You will use EOS Tools Pro to connect to the network. With such a setup, the iCMTGIS PRO app will be able to display the RMS error, the age of the GPS differential correction data as well as the differential station ID. This means that Surveyors and GIS field personnel will be able to check the accuracy of the position data collected in real time. In fact, they could also set a limit on RMS such that the system will only record data with errors that fall within the specified limit.

Please also visit the following sites to read our press release: