TT5 BT338 - Location Delay

mikeprytherch · Occasional Visitor Joined: Aug 04, 2005 Posts: 28

I have just purchased a BT-338 and I am running it with TT5 on an Ipaq 5450. Since using the new GPS (instead of the original TT Wired GPS) I have noticed that the location on the map is around 30 yards behind where I am, in other words I have gone past the junction before TT realises and therefore the instructions are late... any ideas ?

cootuk · Occasional Visitor Joined: Jul 17, 2005 Posts: 38

walking or driving?
driving normally or slowly?

There is a mode whereby the gps only updates every few metres if you are going slowly due to the inaccuracies of older recievers - the BT338 should be shipped with this mode off as it has greater sensitivity.

mikeprytherch · Occasional Visitor Joined: Aug 04, 2005 Posts: 28

While driving... not matter what speeds, in fact it seems worse when going quickly, its like it running super slow and can't keep up !

ginosergio · Occasional Visitor Joined: May 09, 2005 Posts: 14

Mike, if this happens constantly you may have some serious problem, but if this happens "sometimes", I'm quite sure that this is the "parity error problem" that give position errors in BT-338 with 3.0.2 firmware.

I own a BT-338 and I also had problems like this, one/two times everyday, before upgrading to 3.1.1 firmware.

Regards.

mikeprytherch · Occasional Visitor Joined: Aug 04, 2005 Posts: 28

Thanks thats great, can I please ask, how do you go about upgrading the firmware ?

ginosergio · Occasional Visitor Joined: May 09, 2005 Posts: 14

You can send your BT-338 for upgrade, to Globalsat USA, read here:
http://www.usglobalsat.com/item.asp?itemid=82

or you can do it by yourself...
read my message in topic:
"BT 338 firmware update now taking place!"

Regards

mixer25 · Regular Visitor Joined: Jan 10, 2004 Posts: 102

I got same issue with mine, it takes sometimes 5 minutes to lock on and sometimes doesn't at all and then I have to soft reset PDA and switch off GPS and back on, then it works.

I will update, but it sucks paying to update something that went out wrong.

mixer25 · Regular Visitor Joined: Jan 10, 2004 Posts: 102

THIS FIRMWARE UPGRADE WILL:

* Upgrade your receiver to allow the SiRF III chipset to be WAAS capable and activated via the “SiRF DEMO” utility software. *

* Improves acquisition and also improves bit sync capability and recovery mode. (This error can cause fix problems from reacquisition after a blockage from receiving data also know as the ‘jet-lag” symptom).

* Improves cold start frequency search range problem, where frequency was not searched properly after 30 seconds.

* Improves potential cold start visible list problem, which could affect performance if all satellites are below 32 db-Hz

* Corrects Message “41” datum field.

* Corrects date stamp not updating.

* Limits the 50 BPS thresholds to 27 to avoid undetected parity errors, which can give position errors.

THIS FIRMWARE UPGRADE WILL NOT:

Change the current function of the “Auto Shut-Off” to activate after 10 min if no Bluetooth connection is present to conserve battery life. This feature is NOT correctable with any firmware upgrades, it is a hardware design with plans to modify the function as a running change on production units by the end of the year.

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