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308 Appendix A — GPS Primer<br />

A<br />

B<br />

FIGURE A-2: Now assume you’re somewhere within this circle.<br />

The area you are in falls within the circle. It’s still quite a big area, but it narrows it down quite<br />

a bit. Now suppose that you also know your distance from Point B (see Figure A-3).<br />

A<br />

B<br />

You are here – somewhere!<br />

You are here<br />

FIGURE A-3: Knowing your distance from Point A and<br />

Point B narrows the field.<br />

C<br />

C

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