Some GPS related iPhone apps I have come to appreciate

Some GPS related iPhone apps I have come to appreciate:
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Offline Topo Maps By TrailBehind
http://itunes.apple.com/us/app/offline-topo-maps/id376535806?mt=8

Basic GPS (Now with UTM, MGRS, and Email) By Richard Hoffman

http://itunes.apple.com/us/app/basic-gps-now-utm-mgrs-email/id293699773?mt=8

Air Navigation Pro By Xample (BRG, DIST, ETE, ETA, SOG, COG, ALT, DIST
TRAVELED, LAT, LON, etc)
http://itunes.apple.com/us/app/air-navigation-pro/id301046057?mt=8

Apple's Maps App
http://www.apple.com/iphone/features/maps-compass.html

What kind of resolution do you get with the TrailBehind topo maps?

On 8/10/10 9:28 AM, Moderate wrote:

The TrailBehind topos at highest resolution are the 1:24,000 Ortho
Quad DRGs. The iPhone screes is 326 dpi and th little black squares
representing small buildings are about 16 x 16 pixels as best I can
measure.

Thanks

On 8/9/10 7:42 PM, Sam Wormley wrote:


Unfortunately Application Developers don't have much to work
with, the limitation being Apple's API which only provides, as
far as I can tell, 3D Position, velocity, and either HDOP and
VDOP or their equivalents.

The iPhone 4 uses the Broadcom BCM4750 GPS Chipset.
http://www.broadcom.com/products/GPS/GPS-Silicon-Solutions/BCM4750
http://pdfserv.datasheetpro.net/Broadcom/4750-PB01-R.pdf