Does the Arrow 100 work with iCMTGIS III or only with iCMTGIS PRO?

The Arrow series GPS receivers work with both the iCMTGIS III and the iCMTGIS PRO.

iCMTGIS III gets the position from the iOS CoreLocation, to which the GPS receiver sends the location information. As CoreLocation truncates the data, accuracy is compromised.

iCMTGIS PRO has all the functionality of iCMTGIS III plus the ability to receive and parse the NMEA message stream directly from the Arrow GPS. iCMTGIS PRO provides the “Enable the External GPS” mode to interface directly with the Arrow GPS receiver. In this mode, the app can display a GPS status bar in real time. It will also let you set a limit on PDOP and RMS to help ensure data quality.

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How to enter coordinates into the Stakeout iCMT app

“I am trying to enter a GPS coordinate into the stake out program, and I am getting some weird results. For some reason the coordinates that I have taken off of google earth are taking me to some point in Inner Mongolia instead of Silverton Oregon. I am using the same format of Degrees, Minutes, Seconds. Could you please tell me what I’m doing wrong?”

Which function are you using to enter the coordinates. If it is the “Locate a Point by Address” function, please make sure to specify the correct E, W, N, S designation.

Another way to enter the coordinates is to get the map for your approximate location displayed then use “Add Point manually” to add a point to the map. Then open the Feature Properties screen for that point and change the coordinates to the desired values.

Is there a video tutorial to show me how to set up a Feature List?

We’ve just uploaded a new video tutorial. Here you go:
https://www.youtube.com/watch?v=gs9Tgclcb6M&feature=youtu.be

App to help plant trees?

“I am wondering if any of your programs could be used in my tractor as a way to guide me in driving a straight line when planting Christmas trees? Even if it doesn’t help me row by row could it be used to help me lay out a planting? Help to drive the first line across a field?”

The GPS system you will need to guide a tractor along a line to plant Christmas trees requires a high-precision GPS receiver used in conjunction with an app that will let you record a few reference points, draw the line on the map and guide the tractor along the line.

The actual equipment and app you select will depend on the accuracy you wish to achieve. Of course, a high-accuracy system comes with a high cost.

The SXBlue Platinum and EOS Arrow Gold GPS receivers can be used with iCMTGIS III to achieve sub-meter accuracy.

The SXBlue Platinum and EOS Arrow Gold GPS receivers can be used with iCMTGIS PRO and a RTK network to achieve cm-level accuracy.

As there will also be visual cues to guide the tractor, do you think sub-meter accuracy will be sufficient for you?

Both iCMTGIS III and iCMTGIS PRO will let you load a geo-referenced background map (*.tif. *.pim or *.bmp). These are useful as a general reference, but they are not accurate enough to let you pin-point your first point or line by digitization.

You could use iCMTGIS III with a SXBlue Platinum or an EOS Arrow Gold GPS receiver to record the property boundary and the starting point to sub-meter accuracy. iCMTGIS III and iCMTGIS PRO will let you create a grid over the property to indicate where the trees are to be planted.

iCMTGIS III and iCMTGIS PRO provide the Stakeout functions to guide you along the grid lines. These apps will display how far the tractor deviates from the line. You could also set up the apps to keep beeping as long as the tractor stays on the line within the specified tolerance.

Do I need cellular data for the app to work?

We received this question regarding the Deed Calls & Stakeout app, but the answer applies to our other apps as well.

The GPS data collection functions and most of the other functions will work without wi-fi and cellular data.

Some of our apps, like Forester GPS GIS III, Farming GPS GIS III, iCMTGIS III and iCMTGIS PRO will let you load a geo-referenced *.tif map and use it off-line.

Most of our apps provide a Map function to get and display the Map from Apple via wi-fi connection. However, you can cache the Map to use out there where no wi-fi is available. This means that you can call up the Map and display the area in which you will be working, turn off wi-fi then go out in the field. You will be able to view the Map while working with your app. As long as you do not play with the Map function while you are out there (such as switching from Show Satellite to Show Hybrid) or close Map, the background map should remain available.

Any Android apps?

An SXBlue dealer wrote:”I am a MAC user, but really prefer Android as a mobile OS. Got a lot more Android interest in the last 12 months than I do iOS interest.”

Yes, we have also received many inquiries about Android apps. However, at this time we do not have plans to develop apps on yet another platform. Currently, we have software for Windows, Windows Mobile/ Embedded Handheld 6.5 and iOS.

Recording property lines

“I have recently purchased a 19 acre field/forest and have a new survey PLAT with freshly marked property pins. I would like to permanently record the data points onto a GPS device such as an iPhone for when the markers are removed (to install fences, argue with neighbors over hunting areas, etc.). I need the app to be able to guide me between the pins while walking with the GPS.”

For your intended use, you will need a high-precision GPS receiver. The GPS built into the iPhone is good to about 30 ft or worse in some situations. This is in adequate for settling arguments between neighbors.

The Deed Calls and Deed Calls & Stakeout apps are for drawing the deed plot by entering the deed calls (bearing and distance information). The Deed Calls & Stakeout app will then be able to guide you along this deed plot. To correctly place the plot on the map on the iPhone, you will need to have the GPS coordinates for the first point. These two apps do provide a “Pick GPS” button for you to grab one GPS fix. However, it will be an approximate position if you are just using the iPhone built-in GPS.

As you want to record the positions of the stake points and also be guided to walk between the pins, the system to use is a high-precision GPS receiver like the iSXBlue II+ GNSS or the EOS Arrow Gold with an iPhone or iPad running iCMTGIS III or iCMTGIS PRO. The iCMTGIS III and iCMTGIS PRO apps will let you record a position by taking many GPS fixes and averaging them. They will also let you record an irregular property boundary by walking along the boundary. They provide the Point Stakeout (to guide you to the pins later) and Line Stakeout functions (for guiding you along the property boundary later). They also provide the Deed Calls functionality.

In summary, it boils down to the desired accuracy. Using an iPhone running Deed Calls or Deed Calls & Stakeout app might be adequate for a realtor or a forester (to do a quick approximate deed plot). Deed Calls & Stakeout is useful for someone who needs to find old stakes based on a deed plot. To record accurate stake positions, you will definitely need a much better GPS than the iPhone GPS. If you can accept a 2 m – 5 m (6 ft – 15 ft) error, then you could consider using the less expensive Dual XGPS-150A or Bad Elf GPS.