How do I clear my speed history off GPS

If you have the Genie version of the firmware ending in 'T' it is really simple. Go to the MISC menu. Press the toggle and scroll down to the DELETE menu item. Press again and select DELETE ALL. This will reset you Genie and clear the internal memory SBP file.

Its a good idea to do the SAVE ALL item at the end of your session as well or before you do the DELETE ALL.

The SAVE ALL will save your internal SBP file to the SD card but will also make a text document containing your speed genie 2 second and 10 second speeds. (.SPD). To access it, open the file from your SD card in the computer in "notepad" or equivalent text editor.

If you don't have the Genie 'T' version, you will need to reset the max speed and max 10 sec in the speed menu individually.

You can do it in navlink as well.

My .SPD file definitely does not look like that

Hey Sue, all you need to get it to look like mine is a really windy day, some flat water and a serious disregard for you own health!

If by 'seeing it on your computer' you mean looking at the SD card after it has been inserted in you computer, then that is correct. The 'clear all' menu item just clears what is in the GT-31's own memory (Data logger and Genie).

You probably don't want or need to clear the files off your SD card, even if you have copied them to your computer. The SD card can easily hold many years of saved files, especially if it is the max size of 2GB. It can be useful to have a backup copy on the card. I just checked one of my GPS cards and it has over two years of session files on it that only fill 105MB of space leaving 1.76GB free! I recon I am right on that card for space for about another 15 years!

This is what you get on the SD card when you use the SAVE ALL function in the MISC menu:




The SBN fie is already there as it written to the card in real time. (Note that a new .SBN file is created each time the GPS is turned on)

The SBP file is the file saved from the internal memory, often called the 'Data Logger'. This is a 'circular' type of file. It will continue from where it left off before each time the GPS is turned on, but when the memory is full it will just start to overwrite the earliest part of the file. To me, the big advantage of the 'DELETE ALL' is that it clears the internal data logger memory. This means that the next time you sail you will have only that session in the data logger (SBP) file. The advantage of saving this file is that it is considerably smaller than the .SBN file so it can be uploaded or sent by email much faster. It also has the advantage that if you turn your GPS off during the day and then turn it on to sail again, there will only be one file for the day (if you cleared the memory before you started), whereas there will be two .SBN files that may have to be joined to analyze a days session

The .SPD file is the contents saved from the Genie (Text file)

The.BIN is.........something...... that is not useful to us as far as I know. No need to copy and save it on your computer.

Hope this helps.

Hi Sue,

I don't know if this has been covered before but here's my basic tips:
Number 1) The only file you need 95% of the time is the .SBN file. It contains your track. If your GPS is set up right, you should get a blank one of these created every time you switch the GPS on, and it will be filled up with data every time you switch the GPS off. (If your GPS switches off some other way than normal, or if you remove the SD card without switching the GPS off first, you can wind up with an empty .SBN file.)

Number 2) The .SBP file is a secondary copy of the same information recorded into a different place. You don't need this file unless something goes wrong with the .SBN file. IF YOUR GPS IS SET UP RIGHT you should not see these files, but you can use the GPS to create one from the data logger menu.

Normal reasons why you might want to use the SBP file:
1) You forgot to put the SD card into the GPS before going sailing.
2) You took the SD card out of the GPS before switching it off, so the SBN file is empty.
3) You accidentally locked your SD card when putting it into the GPS (the little switch on the side of the card does this) which means the SBN file could not be written to the card.
4) You had multiple sessions on one day and want to combine them. Creating a SBP file can join together the data in multiple SBN files easily for you.
5) Your GPS crashed or hung or otherwise died, so you didn't end up with an SBN file on your card.

The SBN and SBP files should normally contain the same information, but they CAN be set up to work differently. IF YOUR GPS IS SET UP RIGHT you should use the same settings for both types of files.

Many sailors religiously create SBP files and clear the memory of their GPS every time they sail. There is no reason to do this if your GPS is set up right. It's just one of those things, like taking off your shoes to get onto a plane, that people do to give themselves the illusion that they are safer.

Dylan.