Comparison Chart
Feature group |
Feature |
Sigma |
Cableless systems with only shootblind capability |
Cableless systems with some data return capability |
Benefit of feature and related issues |
GPS timing |
Internal to ground unit |
Mostly internal to ground unit |
Some systems rely on distributed timing |
GPS reception cannot be guaranteed everywhere. Alternatives may be essential. |
|
Ground unit shape |
Virtually impossible to tip over |
Some systems easy to tip, may lose GPS signal |
Some systems easy to tip, may lose GPS signal |
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High stability internal clock |
Yes |
Not usual |
Not usual |
||
VHF sync |
Option |
Not possible |
Not possible |
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