© 2023 Radiodetection Ltd 26
5.6 Starting a survey and
obtaining RTK fix/float
Start a survey and obtaining RTK float/fix
1. Ensure the GNSS device in the locator has
access to GNSS satellites
2. Select ‘NEW’ from the top right-hand
corner of the app.
3. Select a utility type
4. You will now see a box of information in the top right-
hand corner of the screen. If after 10-15 seconds
‘Diff source’ does not appear then you may need to
toggle the ‘GPS’ button near the bottom of the
screen.
5. The ‘Fix type’ field will display values such as GPS,
DGPS, RTK float and RTK. The LED on the locator
notifies you of RTK float (flashing) and RTK fix
(solid).
6. The time to first fix will be longer as the GNSS
device is performing a cold start. Find an area that
has good visibility of the sky and stand still. This may
take up to 15 minutes for the first fix, but will be
much quicker for subsequent uses.
7. Once RTK float/fix has been achieved you
can start the survey. If the Survey
Measurements log interface is set up
correctly, you’ll see it described as ‘ready’
in the information box.
8. Take Survey Measurement readings by pressing the
Survey Measurement button at set intervals or when
required. The point should appear in the PointMan
app a few seconds later.
9. The RD8200SG is fitted with a level/bubble for
ultimate precision. When taking a survey
measurement reading, the RD8200SG automatically
compensates for the difference between the GNSS
antenna position and the foot of the locator. Keep
the bubble central for ultimate positional accuracy.
Use of the bubble is optional.
Figure 1a.
Locator searching for
satellites
Figure 1b.
locator identified
satellites
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