Note that it takes 11-13 minutes for the sats to download the almanac and ephemeris files (in a clear line of sight to the sats) to the GPS receivers (these files are the data resourced by the rcvrs for their "hot start" function to avoid sat search time). These files expire every 9 days and new ones are released to the sats for download every Monday.

Dear, I've been watching your video. Its a great job. Thanks for your job, it is very instructive !

For anyone who's trying to use NEO-8 for more than GPS and GLONASS satellites, you'll have to enable it at 'GNSS config' AND change the NMEA protocol to version 4.10. As soon as you set it, you'll be able to receive Beidou and Galileo satellites. But you can only set 3 GNSS services at a time(for neo-8), and to change between then you must leave only 2 services, save it, and only then enable the third you'd like. And I have also found much better reception if you desolder the SMA connector if you're not gonna use it. If you're looking foward to use an active sma antenna, then you must desolder the C2 capacitor. This only applies to the M8 boards with soldered ceramic antenna

Thumbs up for the informational video and "here is the guy with the Swiss accent again."

Very helpful information about the precision of these GPS modules. (I am not surprised that a Swiss should be so interested in precision.)

Andreas, as always, an excellent video. I am researching the Neo-M8N and interested to hear your analysis and tips. Thank you for sharing.

Thank you. Your presentations are logical and clear. I love Sweiss

Thank u for the detailed testing, greatly appreciated, and great channel!!!!

Great video. Very helpful. Thanks!

Thanks, Mr. Spiess for another very helpful production!

Many thanks Andreas...

Andreas Spiess = loves deep details = thats why ı love his style. thanks.

under the open sky place outside you can achieve desired accuracy line of sight cleareance required

More than two years later and uBlox has released the neo-M8P which is capable of centimetre level accuracy with corrections. I have found with good view of the sky that the neo-M8N can get down to meter level accuracy without corrections.

Thanks for testing. Developing a device for measuring car acceleration. Seems to be good module for this.

SUPER !! Thanks for your job !!

awesome! really excited to use this with my oled. :-)

When I clicked on the video, I didn't expect such a good video like this

Great work done...

Nice video Andreas . Perhaps it is time for a new video with european Galileo sats results . I have read that 30 of them are already in operation and are supposed to give less than one meter accuracy !

Thank you for your fantastic video

Helpful.. Wondered if the issue about updating the GPS string format is also the case for the NEO-M8Q-0-01 Card variation?

Gruezi "guy with the Swiss accent". Some people might say I have even more a Swiss accent even though I moved from the Berner-Oberland to Seattle a half a century ago ;-) I really enjoyed watching your video and learning many things. Being Swiss we just have to be precise. As a boy I used to walk miles to get to a watchmaker's storefront window to set my watch to the exact time displayed there. ... and soon my "official tested (chronometer stamped)" watch would be wrong again before the quartz crystal electronics.

do you have some altitude code examples for the nodemcu esp8266? I can't seem to find a good example of sea level adjustment.

Great, thank you and congratulation!

First, thanks for the video; I have two questions: 1) Does a Neo-6M sketch work with Neo-8M? 2) Is it possible to extend the GPS antenna? Can any wire be used from the beginning of the board to the other end?

Good comparison, thank you! I have been wondering if to replace the NEO-6 with 8 in my DJI Phantom 1. There are wired modules available for such a low price, that it would be nice to try. But I also know how GPS works, thanks to years of MTB/cross-country biking, recording every ride. It just is not 100% reliable. What is interesting, is that the best weather for GPS has been very humid or even rainy weather. The worst is dry and clear with moderate winds. It must have something to do with the conditions far above the ground (several kilometers), but on the average I had one or two days in a year when unassisted GPS, even sensitive one, did not get fix. Tried everything I can, power off the GPS (Holux GPSlim 236), leave it on the ground still for minutes, smash it on the ground throwing the battery away etc. It normally gets fix in half a minute as expected, but in that dry weather it only got fix after riding for like 2 kilometers. That is just random. I really hate those days :D

Werner Herzog does youtube videos now? Great video btw, do you have any videos that talk about how we can setup 2 RTK receivers using Arduino? To get cm level precision?

GN/GP well spotted! (I noticed some differences between Neon6m and 7m as welk)

Hello, Thank you for sharing your knowledge. Please both 6M and 8M, can they keep RTC in sync? Does 6M have any significant differences? (More than a second?)

great stuff...have you any details regarding the usb serial converter please.? cheers

I recently read that these modules can be programmed with the u-Center software to output a GPS-stabilized frequency between 0,25 and 24 MHz instead of the usual pulse per second (PPS), so that they can be used as a cheap but stable frequency normal. Some modules have a pin to output the PPS-signal, some must be modified to pick up the signal from the input of the pulse-LED. It outputs a square wave of the desired frequency (and Duty cycle), set via u-center. If you find that useful or at least interesting, please make a video on that. Thanks for your excellent work. 73!

I think the actual chip is 3v only, but the board. Isn't there a 3v regulator on the module? I'm waiting on my neo-m8n module, and judging by photos online, it looks like the module can accept 5v and regulates down to 3v. It's difficult to find a definitive answer on these little breakout boards.

Hi can you make a video on using these sensors for differential gps. Ive seen articles saying this can approach can improve accuracy alot.

Super Sach! Merci viu mau. Mau luege obi dr Ungerschid vom M8N zum 6M im Quadcopter merke

Hi Andreas, thanks a lot for good explanation of GPS modules. I would like to know , if you have the info obviously, what can I do with my LEA-6H-0-002 gps module. What I would like to do is: - run it to calculate position at 10Hz instead of 5Hz ( it seems it's not possible with it!! ) - when you speak about profile (Navigation Modes) what really happen in the module? What does it mean? My application is gps module mounted on a Quadcopter to perform RTH, Position Hold and so on. I'm using UBX protocol. Do you suggest to buy another more performing module? - Is it possible to flash new firmware in the LEA-6H-0-002 ? I raise the question to u-blox company without success.... Thanks in advance if you can help me on this. Regards Fiorenzo

Did you used filters like Kalman filter to normalize the data?

Thank you for this information. It is very helpful. I am planning on using the 6M for elevation sensing. Do you think that filtering/averaging the data over the course of an hour would give a reliable reading? At least I know now that it won't be worth changing to the 8M.

Thanks mate! Is bro 6M suitable for APM 2.8 flight controller?

hello mr. spiess, what is your desktop's resolution? looks higher resolution than 1920x1080, or did you shrink your system font size and icons separation?

just what i was looking for, allthough i need some info on using this gps and a cmpass unit for maritime use oon a sail boat. which serail to ubb do i need. thanks again

I would like to see a comparison of these next to some smaller ones, I am interested in how much the size matters. How about you show us the smallest GPS antenna you can find?

Good day sir. What sensor would you recommend for a LORA tracking device to use as less power as possible with accelerometer?

expecting more from you later!!

BeiDou will not work in Europe (according to wiki): "Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are visible.[11] The area that can be serviced is from longitude 70°E to 140°E and from latitude 5°N to 55°N. A frequency of the system is 2491.75 MHz."

The accuracy of a GPS system highly depends on the amount of satellites received and the position of those satellites. For example. If you place the GPS antenna between some buildings and you have a narrow field of view (do not see much sky) the receiver will receive less satellites and the satellites which are received are all around the same position. That means that triangulation will have a big error. Height measuring with a gps will always have a lot of error. The best is to average the height over a long time and calibrate a pressure sensor with it. The pressure sensor will have good short term measurements but bad long term measurements. If the air pressure changes the reading will change a lot. So for the best system you will need both gps and air pressure. That is commonly used in drones for height measurement. You can get a measure of accuracy for the GPS by looking at the HDOP, VDOP, PDOP and TDOP (Dilution of Precision) measurements which are in the EMEA string you get from the receiver. The higher those values the less accurate the readings are. en.wikipedia.org/wiki/Dilution_of_precision_(navigation)

hello, where did you get your M8N from ? cheers Brett

Looks like you are testing an imitation ublox neo m8n. Did you check if it can receive Galileo? Did you check if it can be upgraded to version 3.01 using u-center software? If not then for sure this is an imitation! Performance of a real one is a lot better than those counterfeit models.

Please have a look to the new Neo M8U

Hi Andreas, i was wondering if the Ublox m8u is compatible with the shield that you are using for the m8n

Hoi wie gohts? Find dini Videos echt guet!!!

Hi Can u tell me is it possible to improve my accuracy by using 2 GPS module NEO - 6 M (comparing information)? I mean in Arduino or create app in Delphi XE8 or C#, or any other methodes?

I found this video useful and interesting, especially the discussion of the different NMEA strings output by the NEO-6 and NEO-8 receivers. However, I would like to offer what I hope will be taken as constructive criticism. I would suggest that instead of using the word "precision" to characterize the results, that "stability" or "repeatability" be used instead. In my view, precision is synonymous with resolution: if the device can measure a distance to a resolution of 1 cm, it's more precise than a device that can only measure distance to a resolution of 1 m. If one knows the correct value of a parameter, such as horizontal position in terms of latitude and longitude or elevation/altitude in terms of meters, a device that measures the same parameter with a constant offset of 1 m is more accurate than one that measures the parameter with a constant offset of 10 m. If a device consistently reports the value of a measurement with a variation of only 10 cm over an interval, its measurement is more repeatable than one that reports the value of a measurement with a variation of 50 cm over the same interval. In this video, I got the impression that what was being discussed was repeatability, not accuracy or precision. While the BMP280 may be more stable (its measurements more repeatable) over a measurement interval of, for example, 10 minutes, the elevation data it produces may be less accurate than the GPS elevation data if the atmospheric pressure is not the standard 1013.25 HPa (or 29.92 in. of Hg). One can attempt to correct the BMP280 elevation data using the altimeter setting measurements reported by a local airport. (Google "METAR"). I would also comment that if one does not make measurements of GPS (or GNSS) receivers using actual satellite signals (instead of simulated signals in a laboratory environment) at the same time and place, one is not really doing an apples-to-apples comparison, because the satellites that are in MEO orbit are constantly moving across the sky, and different satellite signals may be blocked either by an obstruction or because the satellites are below the horizon at different times. Well, that's enough (you'll probably say MORE than enough) pedantry for one comment.

is 6m gps module works and get the data if I connect it to computer through avr atmega 128 ? bcause My program that I set to convert the NMEA data into readable longtitude lattitude google maps doesnt work

Very useful. Thankyou. Looks like I'll be using a barometric sensor for relative altitude - my altitude changes are in no way going to be more than a few metres for what I want from the GPS. *then* I need to work on magnetometer (compass) and gyro/accelerometer to use as a clinometer. .... and all because I want to be able to track where I've wandered on the moors.

Try GPS RTK with your M8N and RTKLIB you should get under 1 meter relative accuracy between two receivers.

Hi... Is it possible, using a neo-m8n and U-center, to see the almanach / ephemeris data broadcasted by the GPS satellites ?

I need your help. Do you have a video that shows how to sync the Nextion RTC with the satellite RTC in Arduino? I just got the Neo-M8n for an electric car project along with a Nextion 10.1 to use for the dashboard read out and I want to have it sync the Nextion RTC with the satellites at bootup.

You said the NEO-6 can only receive American (USA) satelites ? What if I try to use it in Canada (Province of Quebec) ? Will it work and if so only with the USA available satelites ? Thanks for your reply..

I find when my model plane lands, the error in location looks like the ones you recorded here. But while flying, it is smooth as silk. Can you explain why?

I have a NEO 6M are there any advantages on ugrading firmware? Where can i finf these scripts? Thanks in advance!

Hello does the value of the gps change if I change the position of gps module from 10-15 cm from the the actual position Are these gps modules so accurate

is SPI interace enabled in those modules?

Good video, I recently compared an Antaris 4 (uBlox 4) vs M8N (uBlox 8) and didn't find any improvement either in terms of accuracy for a static test. It will be much better for navigation in urban environments with lots of blocked signals where the use of additional GNSS systems helps a lot.

for the BME280. I forgot to mention.

Very informative. I'm looking at gps systems but can't make up my mind if I should spend $100 or spend $30 on this Neo-M8N

Hoi Andreas, müsste das GPS Modul nicht blinken bei Satellitenempfang? Grüsse aus Oensingen

My neo m6 doesn´t find the location, I live in Spain. I connected it to 5 volts supply, as I´ve seen on some tutrials, could it have burnt the module? May they be defectuous?

My neo - 6m gps module giving completely error in latitude and longitude.... What to do ..

old video, i know... but aren't altitude sensors based on pressure effected by atmospheric weather air pressure, thus the altitude reading will change based on the weather...

Hello Andreas, do you know how to calculate Accuracy in GPS system? is it possible using HDOP or PDOP?

How can you expect the difference between these measurements? All you do is sensing of time differences in receiving of modulation signal of ca. 1 MHz from different sats, not a carrier of 1,5GHz. The way to increase measurement precision is to use differencial method with reference sycroised to time generator of sattelite. Maybe the way to go is to use NEO8P dev kit with LoRa?

Which one will work with INDIAN GPS SYSTEM (NAVIC) ?? PLease Reply !

hi sir my neo6m antenna - + with multimeter beeps is it normal and when ı touch it spark on my finger. the neo6mv just arrived today also

It's time to make a review of ZED-F9P ? :)

Go to options>playback speed>select1.5 Thank me later

Ok, I was thinking.."Wow, this guy is making me fall asleep". "But wait, he did a really nice test!"...hehheh...Thanks buddy. +trainboy64 does a real quick practical bootup with a naza lite with the stock DJI and the m8n.

Can you tell me which GPS is best for more accurate position, because we have lots of gps modules available in market like SKG13BL, ultimate, ublox neo 6M, NEO 6M, NEO M8N, ublox neo7M, sain smart neo 6M. Please help to find out best gps module that can work with either Arduino uno, nano, Node mcu E866 etc. Thanks waiting for your reply.

my M8N uses $GPGLL NMEA sentence for lat lng. Shouldn't it be included in the defines?

Wait, the Neo-M6 can only pick up US sattelites? Maybe THAT'S why I can't get it to work in Sweden :D Will the M7 and M8 work though?

Which one is best - Neo-M8N OR Adafruit Ultimate GPS (G.TOP - LadyBird 1 [FGPMMOPA6H-MT3339])?

Does neo 6m and m8n share the same library?

Hoi Andreas, a nice comparison, but unfortunately you forgot to include one most important parameter for GPS precision, the DOP (dilution of precision). The DOP is a measurement of the current arrangement (or distribution) of the satellites on the sky. Similar to the issue in triangulation, the further the satellites are apart from each other, the better (or more precise) the reading. In short, it's not just the NUMBER of satellites that helps for the precision (horizontal and equally vertical) but also how far apart they are from each other. 9 satellites more or less in the same direction from the GPS unit may result in worse precision (and more variation in the reading) than e.g. 5 satellites distributed over the whole firmament.

Andreas, I am not receiving any satellites, there are a lot of “green” satellites on your module, but for me there is only one, red satellite. What is the problem here?

correct me if I'm wrong BUT you are only comparing the precision of each component's data stream and NOT the accuracy of each device. What I think you need to do is to check your precise location with respect to a known government geo survey point AND then compare the sensor data to that. For example I've previously in Australia looked as the position of a known official survey point with what Google Earth shows & GE is out with comparison to the official survey point.

The conditions of your test were not the same: different satellites and a different spread of the satellites around the sky. You should compare them by using them at the same time and place.

Funciona casi igual como el VK2828U7G5LF configurado para 5Hz

Hier ist ein Typ mit Schweizer Akzent ! Vielen Dank!!!

Isn't this just a property of positioning systems? If more precise they can be used for targeting systems, what you don't want.

hi i can find the TinyGPS++ file for the neo m8n on github can you replase the link or send me the file manny thanks

In 6M, What does M stands for ?

hi, good night from turkey. I need this card's eagle files. İf you have got this, can u share with me?

I didn't understand if you said accuracy was withing 6 to 10 centimeters or 6 to 10 meters. If you said meters then accuracy in regard to the GPS sensors is an oxymoron.

What about V.KEL VK2828U7G5LF ? :)

Stationery GPS is not so accurate, when moving the precision gets better. Multipath, Selective Availability and ionospheric effects is important to pecision, Multipath is problematic when stationery .

With the antenna for my 6M module sitting in a window the altitude varies from 470 to 481 Meters! That's not very good precision!

Could I have your mail? I can't do it with NEO M8N

Humm ... "open field precision" interessiert. Die messung von hauswandreflektionen interessiert weniger. Für absolute höhenmessungen empfehle ich "sensor fusion" zwischen gps und bme280. Gps tiefpassfiltern plus bme280 hochpassfiltern. Das machen drohnen mit gyro und accel sensor auch so, gyro integriert mit hochpass pluss accel mit lowpass. Jeder sensor macht das wass er gut kann.

When I finished my comment, Google placed an advertisement on the screen. It was from a vendor called rcmoment.com, and they were selling what they claim is a NEO-M8N based module. It is in fact fraudulent. It uses a Chinese chip set called BN-880. It us not a genuine ublox part. They are using the ublox name in an illegal manner.

I´ll try to add the neo-M8N to my lawn mower robot.........., let´s see....