I am looking to purchase an app primarily to measure fields in remote locations. Will your app operate using gps signal as opposed to using wifi/3G?

If you are looking to measure fields by logging GPS fixes, you can do so by using the iCMTGIS II, Utility Data Collection, Farming GPS GIS II or Forester GPS GIS II app for iPad, or the iGPSGIS II app for iPhone.

The GPS data collection function will work in remote areas without wi-fi/3G. Please note that, if you need about 1 meter to 3 meter accuracy, you should get an external Bluetooth GPS receiver such as the Bad Elf GPS, the Dual XGPS 150A or the Garmin GLO to use with your iPad or iPhone. To get sub-meter accuracy, there is the iSXBlue II at the upper end of the price spectrum. (3/11/15 edit: Now there is also the EOS Arrow available.)

(Farming GPS GIS II and Forester GPS GIS II also provide the Stakeout functions, which will help lead you to locations with known coordinates.)

A number of our other apps provide the PickGPS tool. If the farm plots are more or less regularly shaped and you have a reasonably good GPS receiver, you could use the Add Area Manually function (such as in Stakeout iCMT, Farming GPS GIS or Forester GPS GIS) and tap on PickGPS to add nodes as you walk along the perimeter. Then when you tap on the Back button, the area Feature will be created.

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