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Thread: Compact flash gps compatability question

  1. #1
    Constant Bitrate NUIpIsqo's Avatar
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    Compact flash gps compatability question

    I am contemplating on whether to buy the Holux GM-270 or the GlobalSat BC-307. I am going to use Copilot Live Laptop 7. If it doesn't matter, here's some stats for the two, can someone help me with my decision?

    GlobalSat

    Interface: Compact Flash type I
    Output Messages: NMEA0183 protocol, and supports command:
    GGA, GSA, GSV, RMC, GLL, VTG
    Datum: WGS84
    Hot Start: 8 sec.average
    Warm Start: 38 sec.average
    Cold Start: 48 sec.average
    Altitude Limit: 18,000m(60,000 feet)Max.
    Re-acquisition: 100ms
    Velocity Limit: 515 meters/sec(1000knots)Max
    Jerk Limit: 20 m/sec**3
    Horizontal Accuracy: 15m 2d RMS without SA
    - 10m 2d RMS WAAS enable
    - 1-5m DGPS correceed
    Vertical Accuracy: 40m 95%
    Velocity Accuracy: 0.1m/sec 95%
    Time Accuracy: 1us synchronized to GPS time
    Dimension: 95 mm*47mm*17mm
    Power Consumption: 90 mA(include Antenna)
    Voltage: DC 3.3V +- 10%
    Storage Temperature: -40C ~ 85C
    Operation Temperature: -30C ~ 80C
    Humidity: Up to 95% non - Condensing


    Holux

    Tracks up to 12 satellites
    Weight : < 50g
    Update Rate : 1 Hz
    Receiver : L1, C/A code.
    Tracks up to 12 satellites.
    Dimension : 91 50 20 mm
    Minimum Signal Tracked : -175 dBW
    Store Temperature : -45 C ? + 85 C
    Antenna Type : Built in Atcive Antenna
    Operation Temperature : -10 C ? + 70 C
    Snap Start : < 3 sec (at < 25 minutes off period)
    Operation Humidity : 5 % to 95 % No condensing
    Power Consumption : < 80 mA at 3.3V +/- 10%
    Non DGPS (Differential GPS): Position : 5 - 25 m CEP without SA
    -Velocity : 0.1m / sec
    -Time : 1 usec sync GPS time
    EGNOS/WAAS /Beacon:
    -Position : < 2.2 m, horizontal 95 % of time
    --< 5 m, vertical 95 % of time
    Reacquisition: 0.1 sec. averaged
    Hot Start: 8 sec. averaged
    Warm Start: 38 sec. averaged
    Cold Start: 45 sec. averaged
    NMEA Protocol Output: V 2.2
    -Baud Rate : 4800 bps
    -Data Bit : 8
    -Parity : N
    -Stop Bit : 1
    Output Format:
    -Standard : GGA, GSA, GSV, RMC
    -Optional : GGL, VTG, SiRF Binary
    Altitude: 18,000 m ( 60,000 feet ) max
    Velocity: 515 m/sec ( 700 knots ) max
    Acceleration: 4G, max
    Jerk: 20 m/sec, max


    Okay, i don't understand most of that, but the difference in price:
    Holux GM-270: $100 shipped on ebay (+ $10 CF to PCMIA Adapter, free external receiver)
    GlobalSat BC-307: $70-90 shipped on ebay (Generally free Adapter and external receiver)
    is it worth the potentially $40 difference?

    Thanks in advance for the help guys. And hopefully this will help some people trying to find out the same thing.
    52-hit-combo?! Is that really necessary?

  2. #2
    Maximum Bitrate Yuriy's Avatar
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    I got the BC-307, an excellent receiver and it is compatible with all GPS software out there.
    I get a lock on up to 10 satellites (out of 12 possible) while most people get 5-7.

    Best part, is that if you have a Pocket PC - you can use the BC-307 in it as well.
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  3. #3
    Constant Bitrate NUIpIsqo's Avatar
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    how quickly do you get a lock?
    52-hit-combo?! Is that really necessary?

  4. #4
    Constant Bitrate NUIpIsqo's Avatar
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    have you tried using the gps on your laptop? are the drivers apart of the package?
    52-hit-combo?! Is that really necessary?

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