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Garmin Mobile PC with Trimble Placer 450 GPS?
ND4SPD
Greetings everyone,
I have been trying to get Garmin Mobile PC to work with a vehicle mounted Trimble Placer 450 GPS. The Trimble GPS starts out in their proprietary TAIP protocol, which I have switched over to NMEA for output on the MDT (mobile data terminal) port on the Placer unit.

My problem is this. The Trimble unit is sending out NMEA sentences, but the Garmin software isn't reading them. I've verified that the sentences are coming out via a Terminal program. I've also gotten the Placer 450 to work with iNav iGuidance, Street Atlas 2K9, Streets and Trips, Etc... The Garmin program seems to be the only one that doesn't work. In looking at the output from the Placer 450, I've noticed that some of the data spaces are blank. So for example you might see:

$GPGGA,000105.995,0000.0000,N,00000.0000,E,,00,50.0,,M,0.0,M,,0000*77

If I use GPSGate to simulate a GPS I've noticed there is always a '0' in those blank fields. So I'm thinking the ,, is confusing the Garmin software. I've also tried using GPSGate to convert the TAIP messages to NMEA, but that doesn't seem to work either. MPC sees that there's a GPS there, but no tracking information ever comes up on the GPS info screen. Anyone have any ideas?
Marvin Hlavac
Quote:
Originally Posted by ND4SPD

...I've also tried using GPSGate to convert the TAIP messages to NMEA, but that doesn't seem to work either...
Try to set the Trimble unit to NMEA, and then use GPS Gate + Garmin Mobile PC .

Welcome to the forums, ND4SPD.
tcassidy
I think this is a problem with GMPC not playing nicely with real COM ports any more. As Marvin suggests, filtering it with GPS Gate should provide a COM port that Garmin will respond to.

Terry
ND4SPD
Tried doing the GPS Gate filtering... but it doesn't seem to affect the null spaces I mentioned.

Here is the Raw TAIP output:

>RPV84812+4305930-0894957200006701<
>RPV84812+4305930-0894957200006701<
>RPV84812+4305930-0894957200006701<
>RPV84812+4305930-0894957200006701<

Raw NMEA directly from the 450

$GPZDA,233816.000,27,01,2009,,*54
$GPGGA,233317.000,4303.558102,N,08929.743180,W,1,03,02.91,+000320.03,M,,M,,*7B
$GPGLL,4303.558102,N,08929.743180,W,233317.000,A*2D
$GPGSA,A,2,21,18,22,,,,,,,,,,0003.08,0002.91,0001.00*39
$GPVTG,066.611,T,,M,000.1271,N,000.2356,K*61
$GPZDA,233817.000,27,01,2009,,*55
$GPGGA,233317.000,4303.558102,N,08929.743180,W,1,03,02.91,+000320.03,M,,M,,*7B
$GPGLL,4303.558102,N,08929.743180,W,233317.000,A*2D
$GPGSA,A,2,21,18,22,,,,,,,,,,0003.08,0002.91,0001.00*39
$GPVTG,066.611,T,,M,000.1271,N,000.2356,K*61
$GPRMC,233317.00,A,4303.558102,N,08929.743180,W,000.127,066.61,270109,,*14

Through GPS Gate

$GPZDA,234029.000,27,01,2009,,*57
$GPGGA,233317.000,4303.558102,N,08929.743180,W,1,03,02.91,+000320.03,M,,M,,*7B
$GPGLL,4303.558102,N,08929.743180,W,233317.000,A*2D
$GPGSA,A,2,21,18,22,,,,,,,,,,0003.08,0002.91,0001.00*39
$GPVTG,066.611,T,,M,000.1271,N,000.2356,K*61
$GPRMC,233317.00,A,4303.558102,N,08929.743180,W,000.127,066.61,270109,,*14
$GPZDA,234030.000,27,01,2009,,*5F
$GPGGA,233317.000,4303.558102,N,08929.743180,W,1,03,02.91,+000320.03,M,,M,,*7B
$GPGLL,4303.558102,N,08929.743180,W,233317.000,A*2D
$GPGSA,A,2,21,18,22,,,,,,,,,,0003.08,0002.91,0001.00*39
$GPVTG,066.611,T,,M,000.1271,N,000.2356,K*61

And here is a dump from my Belkin Bluetooth GPS which works with Mobile PC

$GPGGA,234606.096,0000.0000,N,00000.0000,E,0,00,50.0,0.0,M,0.0,M,0.0,0000*7C
$GPGSA,A,1,,,,,,,,,,,,,50.0,50.0,50.0*05
$GPGSV,3,1,12,21,89,000,27,14,70,000,00,22,63,000,00,18,42,000,00*77
$GPGSV,3,2,12,03,40,000,00,09,23,000,00,10,08,000,00,29,02,000,*74
$GPGSV,3,3,12,28,-05,000,00,26,-06,000,,01,-06,000,,06,-07,000,*71
$GPRMC,234606.096,V,0000.0000,N,00000.0000,E,,,120928,,*1E
$GPVTG,,T,,M,,N,,K*4E
$GPMSS,0,0,0.000000,200,*5A
$GPGGA,234607.096,0000.0000,N,00000.0000,E,0,00,50.0,0.0,M,0.0,M,0.0,0000*7D
$GPGSA,A,1,,,,,,,,,,,,,50.0,50.0,50.0*05
$GPRMC,234607.096,V,0000.0000,N,00000.0000,E,,,120928,,*1F
$GPVTG,,T,,M,,N,,K*4E
tcassidy
Totally meaningless to me. I was going to suggest the data rate might be too high (GMPC tops out at 38,400) but you said it works with S&T (4800).

Terry
ND4SPD
I can try bumping the data rate down to 4800 BPS, it's at 9600 right now. I've done a GPS simulation using GPS Gate and it will pick up the simulated data coming across the emulated port so I don't think it's the baud rate. Probably sloppy programming on Garmin's part.
ND4SPD
Looks like I've found the culprit... the Garmin software apparently doesn't like the fact that the Placer 450 doesn't output the $GPGSV (Satellites in view) command. Using GPSGate I created my own NMEA log file and added in the $GPGSV sentences from my BT GPS and voilla it worked. Now, all I have to do is convince Garmin to issue a patch addressing this issue.
Marvin Hlavac
Check the manual for the GPS receiver. Perhaps there is a way to enable GSV.
tcassidy
It is as likely for Trimble to offer a firmware update as Garmin to patch GMPC for that GPS only.

Terry
ND4SPD
Well, I found a temporary workaround using GPSGate... basically I used some of the captured $GPGSV sentences from my Belkin GPS and am using the MUX feature of GPSGate to combine those sentences with the ones actually coming out of the GPS. It's convoluted, but it works. I think I'm still going to bug Garmin a bit... I think the Placer 450s might be a legacy product so I doubt Trimble will be willing to issue a firmware update. I also found that there are other 3rd Party GPS' out there that likewise don't output the $GPGSV sentences and cause the Garmin software to sit there like a rock. So it wouldn't be a patch for just the Trimble GPS
Simbalage22
Quote:
Originally Posted by ND4SPD
Well, I found a temporary workaround using GPSGate... basically I used some of the captured $GPGSV sentences from my Belkin GPS and am using the MUX feature of GPSGate to combine those sentences with the ones actually coming out of the GPS. It's convoluted, but it works. I think I'm still going to bug Garmin a bit... I think the Placer 450s might be a legacy product so I doubt Trimble will be willing to issue a firmware update. I also found that there are other 3rd Party GPS' out there that likewise don't output the $GPGSV sentences and cause the Garmin software to sit there like a rock. So it wouldn't be a patch for just the Trimble GPS
Did you ever find out if they fixed this? I have one and same problem. Works with EVERY gps software but the latest garmin. I use gps Xport and same results. I have bought several of the gps usb dongles and seems the heat and temps kill them. The placer is a tank and would love it to use it with Garmin but don't want to go through a lot of touble just to navigate. Inav was king but they aren't making any new maps
Ken in Regina
You might take a look at ALK CoPilot. ALK seems to be the only mainstream vendor still actively developing their software and their maps on all mobile platforms including laptops. I'm using it on my Android phone and tablet because Garmin refuses to port their Streetpilot Onboard from Apple to Android so they have nothing for Android.

...ken...
Boyd
Quote:
Originally Posted by Simbalage22
Works with EVERY gps software but the latest garmin.
But there really isn't a "latest garmin". They abandoned MobilePC several years ago.

Quote:
Originally Posted by Ken in Regina
Garmin refuses to port their Streetpilot Onboard from Apple to Android so they have nothing for Android.
Actually that isn't true. Garmin does offer StreetPilot for Android, but I don't think they make it available in the North American market. I don't have an android device, so I can't say for sure...

https://play.google.com/store/apps/details?id=com.garmin.android.obn.client&hl=en

There's a site where users have posted instructions for hacking it to make it work. I will not post a link, because I have a problem with their attitude about piracy.

Personally, I have an iPhone but I've never used the StreetPilot app. The last time I looked, it was very limited and doesn't even scale itself for the iPhone's "retina" screen or other high resolution devices like the iPad.
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