what is the right way to cold start BT338? is my 338 faulty?

[lostway]

Hi all

I found my BT 338 can not cold start when moving,it will never get fixed.

I tested it when I was walking or dring and when I was on train and aeroplane.

The only thing you can do is moving after cold started.
Eveytime before I drive,I need sit inside the car waitting my 338 get fixed,otherwise you can't use tomtom.

is it normal?

[astrocompass]

Hi lostway

Sounds a little odd. Mine fixes in a few seconds whilst sitting in a stationary car (no big deal to wait) and admittedly took a little longer on an intercity express at full bore, but still did it.

How long do you have to wait in your car to get a fix? How often do you use it (satellites move about a bit over time)? Always from the same location? Or does your car have one of these newfangled windscreens that block reception? Might be better able to help if you can provide answers to these issues
_________________
Garmin 2360LT
iPaq 2210 TTN5.2

[lostway]

Hi astrocompass

Thanks for your help! I try answer you as detail as possible.

1, How long do you have to wait in your car to get a fix?

1-2 mins when car is stationary,never get fixed while driving.

2,How often do you use it (satellites move about a bit over time)?

every 2-3 days

3,Always from the same location?

No

4,Or does your car have one of these newfangled windscreens that block reception?

No, it is the standard windscreen. can get 10-12 satellites when using.


yesterday I took virgin train from london to manchester,it wouldn't cold start,never get fixed.

just can not cold start when moving.

[SimonCatlin]

Try removing the battery and leaving the unit for about 1 minute and then re-insert the battery.

You may find it locks quicker.

Also what version of the SIRF software do you have? There is a known bug in the software prior to 3.1.1. Check the board here on how to check the software version (It is not that difficult). The bug was for those who had taken the unit on a plane and used it as the altitude and different speeds caused problems with the almanac and that in turn caused problems with get a lock later on. Hence the reason for taking the battery out and trying again. It'll make the Almanac be re-downloaded.


Great unit though!
_________________
iPhone5, TomTom, Google maps, Navfree, Viewranger and Apple Maps (ekk)

[lostway]

Hi SimonCatlin

Thanks for your advice! Very helpful!

I checked the 338,it is the early version.
updated my 338 to 3.1.1 tonight.

It works like dream now.

useing gpsinfo to test cold start, result is great.

when drving, cold start took 220 sec x.
when walking, cold start took 110 sec.

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