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Editorial Team
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Asked: 2026-05-22T00:01:43+00:00

I have a GPS tracker that a friend lent me. It’s a chinese model,

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I have a GPS tracker that a friend lent me. It’s a chinese model, with sparse documentation.
It’s got a built in gps and a gprs module (sim) and it’s sending me my data to a particular IP address.

I can’t figure out what all the numbers mean. I got latitude and long thanks to the N and E. but the rest I’m not sure about.

Here’s an extract from my log:

4/28/2011 6:48:01 PM (001__450BP00BP05000001__450BP00110428A2451.6491N06700.6385E000.013474342.72000000000L0001ADFE)    
4/28/2011 6:48:18 PM (001__450BP00BP05000001__450BP00110428A2451.6491N06700.6385E000.013480942.72000000000L0001ADFE)    
4/28/2011 6:49:23 PM (001__450BP00BP05000001__450BP00110428A2451.6491N06700.6385E000.013490942.72000000000L0001ADFE)    
4/28/2011 6:50:33 PM (001__450BP00BP05000001__450BP00110428A2451.6362N06700.6297E000.0135016198.8300000000L0001ADFE)    
4/28/2011 6:51:39 PM (001__450BP00BP05000001__450BP00110428A2451.5203N06700.5738E000.0135114135.3800000000L0001AEFF)    
4/28/2011 6:51:42 PM (001__450BP00BR02110428V2451.4962N06700.5942E000.0135133143.7700000000L0001AF23)

Note: the exact string from the tracker is stored within the round brackets (…)
I gave the dates and times because they may help decode the data if the tracker reports UTC time or something. Didn’t see anything matching the time signature though

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1 Answer

  1. Editorial Team

    It would help if you post some more information (any serial numbers or other text on the device).
    However, the messages look like GPS518.

    I’m mostly guessing, but if I deconstruct the first line, I think this is the meaning:

    Request

    • 001 : ?
    • 450 : deviceid
    • BP00 : handshake
    • BP05 : command
    • 000001 : ?

    Response

    • 450 : device id
    • BP00 : command
    • 110428 : date (format yymmdd)
    • A
    • 2451.6491N : Latitude
    • 06700.6385E : Longitude
    • 000.0 : Speed (format nnn.n)
    • 134743 : Time (format hhmmssas UTC) You probably live in GMT-7
    • 42.720 : Heading/Bearing (?)
    • 00000000L : Elevation
    • 0001ADFE : ?

    There’s a discussion here that might be of interest:
    http://sourceforge.net/projects/opengts/forums/forum/579834/topic/3871481

    After some googling, I found this. It seems to generate message in roughly the same format as the ones that you are receiving:
    http://kmmk.googlecode.com/svn/trunk/kmmk/src/com/gps/testmock/CommAdapterYD518.java

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