[超感度]藍芽GPS BT338 路測

There is a very good review of BT-338 inside coated windshieds car. Check it out!

http://www.gpspassion.com/fr/articles.asp?id=143&page=4
大致看一下Bystander6建議那篇文章,
1.確定BT338在有隔熱紙下定位,確實有些困難,但是定完位後,穩定度夠,經過遮蔽物後,恢復定位很快,和版上大大測試結果一致
2.原來是BT338(9553,236)不適合用在SN導航(如登山,徒步旅行),因為誤差很大,真是有一好(定位快),沒兩好(準度夠),倒是9537,231可以加減用
如果有錯誤,請幫忙修正,謝謝
SN is Static Navigation. Static Navigation will prevent the GPS location from little wondering but the GPS location won't move until the movement is over 50 meters.

GlobalSat decided to disable SN on BT-338 so that walking navigation is possible. However, by doing so, there will have a small wondering of GPS location when actually there is no movement.

I think this is the nature of any kind of GPS chipsets. Holux GPSlim 236 and GlobalSat BT-338 will be the same at this matter.
to Bystander6:
所以我說9537 or 231是不是比起338 or 9553 or 236較適合SN,有沒有錯誤,請指教
glwang
No, if the GPS with SN enabled, then it is not suitable for walking navigation. Both SiRF II/LP and SiRF III chipsets can be either SN enabled or disabled.

Imaging that you need to walk for more than 50 meters to make your GPS location move. I personally like SN disabled, which is what BT-338 is doing now. I am not sure about Holux GPSlim 236's SN setting.
glwang wrote:
to Bystander6:
所以我說9537 or 231是不是比起338 or 9553 or 236較適合SN,有沒有錯誤,請指教


如果說gr230(不是230+)或9537一代比較適合徒步導航,可以這麼說,但是231跟9537 II都是Sirf II Xtrac2.0的晶片,裡面的運算模式比較接近sirf III,微量的偏移,是不會顯示的,您可以參考一下,有一篇四款gps的比較,裡面包含gr230+,gr230+的運算方式應該跟gr231差不多,您可以看到該篇測試相較於其他三顆gps,微量偏移幾乎不會顯示

說一好沒兩好,也不是沒道理,不過基本上這種gps,本來就不是要給登山用的,相信也沒多少對應的軟體,這種gps,不是配nb就是配pda,這兩者的蓄航力都遠遠不及garmin的產品,更別堤防水性了,所以也別太在意這點了
to Bystander6:
你的意思是只要BT338 disable SN功能,定位就不會亂飄是嗎,而231,9537,本來就沒有SN這個功能,所以定位亂飄比較小(在人沒有移動時)是嗎?
謝謝回應
感謝川島,瞭解了,謝謝
也感謝Bystander6,更瞭解他的意思,謝謝
回頭看Alias的報告,更加明白了,再一次謝謝Bystander6
請問一下SN是啥東西? 又如何將SN關閉呢? 我想在我的BT-338上面試試看~
If you look at the following test report, you will know what I am talking about. The SiRF GPS is SN enabled. All the other three (Nemerix, Xemics, & Ftech) are SN disabled. The SN disabled ones will move when you move. The SN enabled one will not move till you move over certain distance.

http://www.mobile01.com/topicdetail.php?f=130&t=62556&last=444458

The picture is here:

http://www.mobile01.com/viewimage.php?url=http%3A%2F%2Fattach.mobile01.com%2Fattach%2F200502%2Fmobile01-5358b4a1e48540e73a5dd5f9a81e64f5.jpg
If you get BT-338 today, it should be SN disabled. Don't worry about this.

If you want to know more about SN, look at section 4 of the following link.

http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=25575
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