Compact flash gps compatability question

NUIpIsqo · 08-02-2004, 01:59 AM

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: -40°C ~ 85°C
Operation Temperature: -30°C ~ 80°C
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.

Yuriy · 08-02-2004, 03:05 AM

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.

NUIpIsqo · 08-02-2004, 03:55 AM

how quickly do you get a lock?

NUIpIsqo · 08-02-2004, 05:48 PM

have you tried using the gps on your laptop? are the drivers apart of the package?