I think part of it may be whether you are using WAAS. I used to have a Garmin handheld GPS with WAAS and the accuracy would increase over several minutes as it tracked more satellites and applied the WAAS corrections. Now they have units that use both GPS and GLONASS and some even add Galileo. I don’t know if that improves accuracy by giving you more satellites, or if it just speeds up the process.
Honestly though, if the structure is on Google Earth, that’s probably plenty accurate. So the important thing might be a photo of the installation. From: AF <[email protected]> On Behalf Of Steve Jones Sent: Thursday, February 13, 2020 8:57 PM To: AnimalFarm Microwave Users Group <[email protected]> Subject: Re: [AFMUG] App or tool for CBRS GPS Can you elaborate on the accuracy over time On Thu, Feb 13, 2020, 7:44 PM Steve D <[email protected] <mailto:[email protected]> > wrote: I guess it all depends on how you do documentation. Myself, if I had my way, I'd probably have our tech's run something like Smartsheet. Punch in customer info, app will grab gps coords from phone, and have them all in a handy dandy spreadsheet for your office people to attach to the customer file. Apps like this are flexible in that you can set it up to record whatever info you want, and it's (theoretically) easy for the monkeys to use if you create forms for them. See: https://www.smartsheet.com/content-center/product-news/product-releases/quickly-capture-share-exact-locations-from-your-mobile-device . If you don't like to pay more monthly fees, I'm sure there are dozen sketchier free apps that do the same thing. (I used to like one called Memento until I learned it was made in Russia.) Hell, I'd not be surprised if Powercode/Sonar/etc start creating something like it for their systems. Or the towercoverage guys (I think they had an app anyway?). As far as accuracy, all phone app's rely on the hardware itself. If your tech's phone is basically a potato, it's gonna be crap, but I think all modern phones are pretty decent for GPS accuracy. 50m is a lot of wiggle room, and even then, I know android does a pretty decent job just working out location just triangulating from cell towers. Like Bill alluded to, GPS takes time to lock in too. Some people turn off location for battery/privacy reasons, but if you leave it on, it slowly narrows down your location better over time. -Steve D On Tue, Feb 11, 2020 at 3:26 PM Bill Prince <[email protected] <mailto:[email protected]> > wrote: Altitude is the worst measure from GPS. Older Garmin handheld units would vary by +/- 500 feet until they'd been on in a single spot for about 45 minutes or so. I just turned on my phone GPS, and it's been running about 70' to 100' too low. It may settle out near the actual altitude, but I don't know how long that will take. I'd use Google Earth for a relatively accurate elevation for a given spot. bp <part15sbs{at}gmail{dot}com> On 2/11/2020 2:17 PM, Steve Jones wrote: Im not worried about altitude, was just looking for an accurate coordinate. Are any phone apps any more accurate than others? is a garmin any more accurate than a phone? On Tue, Feb 11, 2020 at 3:58 PM <[email protected] <mailto:[email protected]> > wrote: Garden variety GPS will give you crap for altitude. GPS in general is crap for altitude. Google Earth plus a tape measure is your best accurate solution for less than multiple thousands of dollars. From: Steve Jones Sent: Tuesday, February 11, 2020 2:45 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] App or tool for CBRS GPS If I give any variance to the installers, they will push it too far. I dont care that we get the 50 meters, I want it as accurate as possible. AGL is fin for guessing, but GPS I want as accurate as possible and within reason. and documented. Im thinking thats also going to be something the SAS administrators will be offering is the high resolution plotting since they will need something to market On Tue, Feb 11, 2020 at 3:11 PM castarritt . <[email protected] <mailto:[email protected]> > wrote: Horizontal accuracy is to within 50M, and if one of my guys has to carry his ladder that far from where he parked the truck (which records GPS location automatically), I'm sure I'll hear him bitch about it. On Tue, Feb 11, 2020 at 3:04 PM Ken Hohhof <[email protected] <mailto:[email protected]> > wrote: I guess in theory the SAS might grant you a lower EIRP than it otherwise would if you overstate the height by a meter or two. Hard to believe that will make a big difference. -----Original Message----- From: AF <[email protected] <mailto:[email protected]> > On Behalf Of Mark Radabaugh Sent: Tuesday, February 11, 2020 2:24 PM To: AnimalFarm Microwave Users Group <[email protected] <mailto:[email protected]> > Subject: Re: [AFMUG] App or tool for CBRS GPS Tape measure? $8/each on Amazon. They can lose a lot of those. Height tolerance is +/-3M (~9’). Each story of a house is ~10’. Did they put it on the first, second, or third floor of the house? Mark > On Feb 11, 2020, at 3:11 PM, Steve Jones <[email protected] > <mailto:[email protected]> > wrote: > > Im not looking for a smartligner, we will get one hopefully for base stations > > For the installer, I need something the installer sticks in front of the > radio to get the GPS. as I understand it, the AGL.ASL is not accurate from > GPS, that needs to be tape measured or range finder. > > Is there an App for a phone that is more accurate than another or is that all > dependent on the cell phone itself? > > Is there a fairly inexpensive device thats worth giving a tech to break too? > > Mainly I just want to have a screenshot of a GPS coordinate to attach to the > customer file for CPI reference. > > There used to be a WISP app that you put in all your POP locations and it > would give you your azimuth and best guess elevation from your current point, > I think it even had a pointing arrow that never worked all that well., but I > dont recall what was or if it still works > -- > AF mailing list > [email protected] <mailto:[email protected]> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com _____ -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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