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How to build (cont.)

Sight lines
- Web (TopoZone - http://www.TopoZone.com)
- Low cost software (TOPO!, Terrian Navigator)
  - Down side
    - Earth curvature may not be calculated unlike professional software.
    - Accuracy may be off several hundred feet.
- Couple of examples with Terrian Navigator:
  - Matt <-- 2m --> Water Tower <-- 2m --> Rebecca ...