Re: GPSMAP 60Cx or 76Cx?

Wolfgang S. Rupprecht wrote:
They also only log 6 decimal places of lat/lon which seems awfully
disproportionate seeing how no other aspect of this format strives for
any kind of efficiency. If they are still using what they call
semi-circles internally, the internal representation is roughly
equivalent to 7-8 decimal places. Arbitrarily truncating it from 8
bytes to 6 in order to save 4 bytes total seems silly. After the fact
averaging could have benefited from the extra information.

Wolfgang, I agree. OTOH it is still one more decimal than any other external format Garmin have used previously. For my 76S WAAS/EGNOS/ESTB tests last year I had to write my own sw to download the semi-circle format binary values directly, having 10-cm level info directly available is _nearly_ as good.

Terje


;; semi-circle is 360 degrees divided into 2^32 equal parts.
(/ 360.0 (expt 2.0 32)) 8.381903171539307e-08

-wolfgang


--
- <Terje.Mathisen@xxxxxxxxxxxxx>
"almost all programming can be viewed as an exercise in caching"
.

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