All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: diglloyd.com photography and WindInMyFace.com

Thank you for buying via links and ads on this site,
which earn me advertising fees or commissions.
As an Amazon Associate I earn from qualifying purchases.

Other World Computing...
B&H Photo...
Amazon
As an Amazon Associate I earn from qualifying purchases.
Upgrade the memory of your 2018 Mac mini up to 64GB
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$1199 $779
SAVE $420

$250 $200
SAVE $50

$1699 $1299
SAVE $400

$1499 $1149
SAVE $350

$200 $140
SAVE $60

$89 $69
SAVE $20

$120 $35
SAVE $85

$178 $148
SAVE $30

$3498 $2998
SAVE $500

$3699 $1299
SAVE $2400

$1000 $700
SAVE $300

$3899 $1499
SAVE $2400

$748 $648
SAVE $100

$2999 $1999
SAVE $1000

$1699 $999
SAVE $700

$1698 $1398
SAVE $300

$4499 $4499
SAVE $click

$1399 $1049
SAVE $350

$1149 $799
SAVE $350

$1399 $1049
SAVE $350

$1498 $1198
SAVE $300

$2797 $2597
SAVE $200

$280 $250
SAVE $30

$1699 $1299
SAVE $400

$8399 $7599
SAVE $800

$899 $799
SAVE $100

$1699 $1299
SAVE $400

Altitude on iPhone: ProAltimeter app

The barometric altimeter on iPhones is not exposed as a built-in app or other info feature, such as on the home page of the phone, so I didn’t realize that there is a barometric altimeter on the iPhone 6s Plus (and iPhone 6 and 7).

GPS elevation can be subject to errors of hundreds of feet or more, so I don’t like to use it. As shown below, the error is 28% as the actual altitude is 504 feet yet GPS says it is 358 feet—GPS can be much more in error in the mountains. Also, a good GPS signal may not be obtainable under tree cover or in a tight canyon. Finally, a barometric altimeter is an excellent cross-check.

When I hike, I often know the exact altitude at certain points, at least when I start a hike. So a barometric altimeter is a reliable way of tracking altitude, at least for some hours. And frequently I know the altitude of key points, such as lakes or summits, so exact recalibration is possible.

The Pro Altimeter app for iPhone can be calibrated from GPS automatically, or most critically, one can enter the known altitude. Perfect for my needs (manual entry) and the GPS altitude is a plus for when there is a good constellation of satellites, as shown below.

At fixed altitude, the barometer is useful for showing air pressure, which can hint at weather changes. Too bad the app doesn’t graph the pressure every 30 minutes or so. It has two choices of display as shown, one better for day and one better for night.

Update: I’ve used Pro Altimeter in the mountains now, and it is has one major bug: it doesn’t say when the GPS altitude was last obtained. So it will show an altitude a day or a week old, with no indication of current status. The only clue that the reading is wrong is the barometric reading. The app sometimes has to be left on for several minutes to get a GPS reading (and in canyon it might never get one), yet there is nothing that indicates that the GPS reading is hours or days old and completely utterly wrong.

Barometric pressure and altimeter: one inaccurate and one accurate reading, same location
ProAltimeter iPhone app for iPhone
OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.

YEE HAH!



√ No more slow and noisy hard drives!
OWC Envoy Express

World’s first Thunderbolt 3 M.2 NVME SSD enclosure.

Super fast, bus-powered, 3.3 oz, DIY easy, rugged and compact!


See also OWC Express 4M2
√ No more slow and noisy hard drives!
OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.


Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!
OWC Envoy Pro EX SSD
Blazingly fast Thunderbolt 3 SSD!

Up to 4TB capacity, USB-C compatible.

USB-C model also available


Great for travel or for desktop!

Save the tax, we pay you back, instantly!
View all handpicked deals...

LG UM7370PUA 70" Class HDR 4K UHD Smart LED TV
$1199 $779
SAVE $420

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__