I recently emailed the following to a friend so will paste it here.....
of wjndows becomes the whole issue and I had to work pretty hard to get this. There are 2 primary embedded flaws in windows-
- migration of com ports that occurs potentially every time you boot the GPS from a different USB connection or when another device is plugged in and the machine subsequenty restarted. Windows enters in the sytem registry a new port definition that basically says "here's a new device - connect it to com port (new) - with software
driver Y - and call it (mouse)". Note that "COM" port refers to microsoft's embedded techniques not "communication port"
To ensure that you can get the chart -plotter up and running fast you need rapid fixes that don't rely on your memory
I am attaching some small routines that I have found from quite a lot of digging. To enable rapid deployment I have found that the best thing to do is to save these little tidbits on to your "desktop" When you save them this way they will appear as icons on your desktop
and one click gets you to them - move them down to the bottom of the screen
so thay can show on a reduced sze window when open
Before clicking on com name arbiter, first backup your system registry using all programs-accessories-system tools-system restore if you are on Win XP. When invoked, this routine goes into the registry and for each com port definition it zeros out the values windows has saved, and which cause the migration problem. Note that your mouse might then be disabled. Win then will refind all connected devices and reconnect them to com ports in a nomalized manner IE mouse is 1 or 2 and your GPS should show up as 3 etc.
If your GPS at some future time does not invoke, you simply click on the arbiter icon and corrections will be made automatically and quickly.
- The another major flaw is more serious - your PC can go completely dead and will not reboot. This more frequently occurs when a GPS is connected to the machine. The reason is that energy saving schemes on Win are totally unreliable. For boat power and laptop consumption
reasons this gets to the fore front. You must DISABLE all power saving schemes.using control panel- display-alarm response settings. uncheck them. Thats the easy part.
Harder is the actual Com port power settings - go to device manager- scroll down to and open up univ ser bus controllers. Scroll to USB Hub - right click properties - power management - and uncheck "allow computer to turn off this device to save power". When your GPS is first plugged in Win will apply a default setting that says " when you see a GPS - turn it off to save power when it is not in use". You will have a USB Hub for every USB device plugged in - change the setting for all.
This default setting is used every next time you use the GPS, but if you change the setting once, then Win will remember not to do it.
The web is crammed full of people who have dead PC's and can't turn them on after Win has gone into "hibernation" or "sleep" mode. The HP site has pages of models that are aflicted with problems with PC's than will not turn back on.
If you disable all power saving schemes the screen
saver can be left working on a blank screen, and you can allow the hard drive to turn off. This will save most of the power that these flawed schemes were intended to provide.
The files are"
USBDeview - google
this to find
com name arbiter - dotto
Another win problem is the jerky mouse - This is documented on the microsoft site and on NavMon site and involves the GPS driver being seen as a serial