UTC Time Offset for GPS Data Collection

Now that we have sprung forward to Daylight-Saving Time, if you are still using the old CMT GPS data collectors, please remember to reduce the (absolute value of the) UTC Time Offset setting by 1 hour. For example, if it was previously set to “-8”, change it to “-7”.

As many of our GPS data collector users have switched to using iPad, iPhone, iPod touch devices and our iGPSGIS II or iCMTGIS II data collection apps, we suggest that you also consider moving to the new hardware and software if GPS differential correction is not required.

iGPSGIS II (for iPhone) and iCMTGIS II (for iPad) are compatible with the PC-GPS 09 software. The new system provides real-time GPS positions and does not collect raw data for differential post-processing. As the built-in GPS receivers on iPad and iPhone devices do not provide good accuracy, most users purchase an external Bluetooth GPS receiver (such as the Dual XGPS-150A or the Bad Elf GPS ) to use with our app. These claim 2-5 meter horizontal position accuracy. iSXBlue II GNSS and the EOS Arrow receivers claim much better positional accuracy (and are much more expensive).