GT-11 Downloading

Used my GT-11 for the first time today (taped to my helmet) with my Foretrex on my arm for speed while sailing and GPS max. Nice and easy to take my helmet off when I wanted to look at the GT-11 GPS max and 10 sec ave. The fit of the GT-11 in the Aquapack with a Lego tyre as toggle washer and lashings of tape makes checking back on the run history difficult on the water but it is a very nice feature of Speed Genie.
My question probably answered many times on forums previously is? How do I download the info from the card into realspeed. Can it be done using the GT-11 as a card reading device or do I need a card reader. I can not "see" the GT-11 as a device in My Computer.

Card reader is best, but If you haven't got a card reader, there's a work around.

There's a program called "navilink" you can download fom the locosystem site.
www.locosystech.com/en/page/support-download-datasheets.html

That will "talk" to the GT11 when it's plugged into your computer, but it won't read the new binary files (.sbn).
But it will read the old "track" files.
You have to go to "track", there you're confronted with a ? press "toggle", scroll to "settings" select "speed" press "off" button then press toggle again, scroll to interval, select 1 sec.

This will start recording the old track data to internal memory, which navilink can read.
Possible downside of this is that it's unclear how much internal memory is available if the binary data logger is also recording.

Nat is apparently recording both "track" and "data-logger", and has got a whole session out of both.

And unlike the binary data logger the track recording stops when memory is full, so you have to remember to clear it after download.

There is a command line version of navilink that is supposed to read the .bin files, but I haven't used it.

Don't think you can get the doppler data from navilink.
But it's the way you set up realspeed that determines if the result is doppler.
You have to go to "divisions" in the "view" menu, then right click on the division concerned, select "edit" then a window comes up where you can select doppler.
But I don't think it will work with the navilink stuff.

Trackpoint results can be anywhere up to .5kt higher than display, and doppler .3kt lower than display, especially max speed, because GT11 gives 1sec max, against realspeed's 2 sec

Thanks Andrew. The files I downloaded using Navilink are .sbp files. Will get a card reader today. Question? Do I have to go to data logger function and "save to card" for every session or is the data written to the automatically. Also does one have to "clear" the internal memory and also reset the Speed Genie after each session.

Frant if you are downloading .sbp files through Navilink they have the doppler information in them. The data logger will save a .sbp file to the sd card, it will be the same file if it's .sbp. Yes you will have to save the file to sd card after each session and I usually reset the data logger before as well. The speed genie also needs to be rest before each session. Always best to clear everything before going out on the water. Whilst the NAVi is a great little unit it can get confused when overloaded with computing tasks. Best operating procedure to minimise errors is to switch off logging to sd card and switch off logging in the track file menu. Just set it to record to the data logger as soon as it gets a fix. This way it will have lots of computing power to operate the speed genie and save data to the data logger, I've never had a failure in this setup mode yet. Sometimes if it's writing to both the sd card, the data logger and track file it can miss a reading and you will see a 2 sec recording instead of 1 sec in the data files.

Reran yesterdays .sbn files in Realspeed after doing the Decrepit selection choosing "doppler if available". Realspeed and Speed Genie now within 0.01 knot. I like Roos idea of writing to the data logger only while sailing to save computing power. The implication is that Andrew does this also but others duplicate the data. I guess I will just have to read the manual to find out what I am doing at present.. I just followed Tom's instructions which are nice and straightforward.

Nope. I always log to both the SD card and the data logger. I like to cover all my bases and have a backup if something goes wrong, even though it never has for me yet. In over 100 sessions on 3 different GT-11 GPS (not always with the latest firmware) I have never noticed that I have got any 2 sec data points due to writing to both.

I have a little routine/ritual before I go out every time. I clear and reset the Genie and clear the Data logger.

One reason I like the data logger file is that if it is a long session and I have a break for a while, I can turn the GPS off and still get a single file from the Data logger. Whereas the SD card make a new file every time you turn it on so the files have to be identified and joined.

BTW, I still use firmware V0921b on one gps which writes all the satellite info to the SD card and makes a very large sbn file, often as large as 5mb v's 250kb or less for the sbp file. Still no 2 sec data points. Of course, I always log in Binary, not NMEA. I don't even know how to turn on the 'track' log.....

Fur-fee?
That is how we used to earn lots of pocket money with when fox skins brought big money...
Oh. you me Furphy.

Dibs for also not using "on-fix". All the problems I had occured with track log "on", data logger "on" with "on-fix" off and sd card logging "on" with "nmea" data. The beauty of the Foretrex was its simplicity, the NAVi is a much more complex unit that does have trouble keeping up when you overwork it but does provide a lot more data at higher accuracy levels. My one wish with the unit is a single page setup on screen and everything else disabled. If speedsailing is going to grow the hardware and software has to be made so it's very simple to use and essentially plug and play.

Select the "Track" menu.
Press in the thumbstick and a menu box will appear.
Select "Interval"
Then select "Stop"
Press the thumbstick in again and select "Clear" Select "Yes" and then the log will be cleared.
The trick with the NAVi is too give as much memory and power to the task at hand, logging to the data logger, even small power spikes, especially writing to sd cards can confuse it.
Better safe than sorry.

Thanks Roo. Andrew, I think that downloading from data logger using Navilink II is going to be more straightforward than saving from data logger to card, then removing card and downloading from card specially if you use the datalog file for analysis. The card can simply remain as backup. Navilink II seems pretty simple even if the user interface is straight out of the 90's. If you download Speed Genie a notepad opens with your results.

Set the Memory Card - NMEA items to "sbn". That should be the only item selected.
The other items create NMEA files and allow you to choose the parts of the NMEA data you wish to save. The 'sbn' data contains all the data you need and takes up far less space and processor power and time to write so that is the one to use (unless you specifically have a use for the NMEA format).

It is an excellent idea to wear your GPS in or on top of your helmet. Definitely better reception and less chance of regular immersion, we tend to keep our head above water when ever we can!

my point exactly

All you need to do is create a new alpha division in the main realspeed window.
Can't remember where it is now, but somewhere you're given the facility to "make new division"
Just have to select alpha, 500m and 50m divergence.

I've also made an alpha 500 with 60m divergence, just to let me know when I'm going too wide.

I've just been trialling gpsapro, (it works on my linux desktop, realspeed doesn't)
Some of the doppler numbers coming out of it are slightly higher than realspeed.

Numbers are saved as an html file R.S. in .csv, (don't see advantage either way there)

I don't like the zoom in on mouse function, I'd rather be able to set the zoom and it stays that way until I change it.

Guess I'm just used to realspeed, gpsarpro seems clunky somehow.

Funny Frant, I've been thinking the same thing for ages!!!!

The faster you think you're going the bigger the disappointment when you check the speed!