StuckAgainSteve

Well-Known Member

• Nov 11, 2014

• #21

wammers said:

Your Tom Tom is only accurate on a dead flat road with no raise or fall in gradient.

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Modern systems correct for gradient.

 

wammers

No longer with us, RIP

Donater

• Nov 11, 2014

• #22

StuckAgainSteve said:

Modern systems correct for gradient.

Click to expand...

Must have some serious calculators in them then.

 

StuckAgainSteve

Well-Known Member

• Nov 11, 2014

• #23

wammers said:

Must have some serious calculators in them then.

Click to expand...

Because they have locks on so many channels (satellites) they can accurately calculate position in 3D terms (including altitude) using that as part of the calculation.