Mapping with GPS and a Smartphone

[Native_NM]

I just looked up a few systems.  The system he used resembles the RTK / post-processing systems.  Centimeter accuracy and they really are not that expensive. 

My little Garmin works for me, and the iPhone and the app are pretty good also.

The fun thing for me is to turn it on while flying.  I was on a flight and my GPS said we were at 32,000'.    My unit has the actual altimeter function as opposed to the barometric altimeter which don't work in a pressurized cabin.  I have not researched to see what the difference is - I think the number of receivers or something like that.  I was on a flight once and another guy had a small handheld that didn't give a good altitude at all.  The ground speed was exactly the same as mine.

It's also fun to watch your ground speed of 600mph.

[Woodswalker]

Have run across another free GPS app for Android phones.  Found it, and the Ulysee Gizmos app, at appbrain.com.  The second app is called GPS Essentials.  It has many more functions than Gizmos.  Installed it on my phone, and seems to work fine.  Will take me awhile to get familiar with its capabilities and try it in the field.  Should be interesting to compare its location coordinates with Gizmos.

Don't need a super-accurate GPS device for my uses.  Mainly want to locate rebar survey markers that were set in the 70's.  Intend to use a metal detector once the search area has been reduced by using the phone GPS apps.