Specifications

The ProMark3 receiver includes a feature which estimates the

observation time required to produce a quality solution. This

feature is called the “Observation Range” and is discussed in

more detail later on in this chapter. The Observation Range (or

Observation Timer) takes into account satellite availability and

distribution when determining the required observation time.

If you are collecting data during a period of poor availability

and distribution, you will find the Observation Timer will take

longer to inform you when your survey is completed. It is au

tomatically extending the observation period to compensate

for the poor availability and distribution of satellites.

Analysis of the satellite constellation with Mission Planning

prior to data collection will give you an idea of the time periods

when extended observations will be required

NOTE: The ProMark3 receiver is designed to store GPS data

for only those satellites that are at least 10° above the horizon.

The receiver may lock onto a satellite between 0° and 10° but

will not record this data. When using the Mission Planning

software to analyze the satellite constellation, be sure to set

the satellite cut-off angle to 10°. This will ensure that the sat

ellite availability and distribution presented by Mission Plan-

ning matches what is being used by the ProMark3 receiver for

data storage.

NOTE: The ProMark3 will track up to 12 satellites simulta-

neously. If more than 12 are available, ProMark3 will track the

12 satellites with the highest elevation.