I get varied results.  
Some 
      Segmentation fault.  
Some 
     usb_set_configuration failed, probably because kernel driver ''
     is blocking our access to the USB device.
Some hangs
Never an output file

# uname -a 
Linux asus 2.6.27-11-generic #1 SMP Thu Jan 29 19:24:39 UTC 2009 i686 GNU/Linux
Ubuntu 8.10

# lsusb | grep Garmin
Bus 004 Device 007: ID 091e:0003 Garmin International GPSmap (various models)

# >more  /etc/udev/rules.d/51-garmin.rules 
SYSFS{idVendor}=="091e", SYSFS{idProduct}=="0003", GROUP="plugdev", MODE="666"

# ls -l /dev/bus/usb/004/007
crw-rw-rw- 1 root plugdev 189, 390 2009-04-05 23:07 /dev/bus/usb/004/007

====== A usb_set_configuration failed ================
sudo gpsbabel -D9 -i garmin -f usb: -o garmin -F test.loc
GPSBabel Version: 1.3.5 
TX [12]:00 00 00 00 05 00 00 00 00 00 00 00 ............(SESREQ  )
TX [12]:00 00 00 00 05 00 00 00 00 00 00 00 ............(SESREQ  )
TX [12]:00 00 00 00 05 00 00 00 00 00 00 00 ............(SESREQ  )
RX (intr) [16]:00 00 00 00 06 00 00 00 04 00 00 00 b1 38 74 bd .............8t.(ACK     )
TX [12]:14 00 00 00 fe 00 00 00 00 00 00 00 ............(PRDREQ  )
RX (intr) [16]:00 00 00 00 06 00 00 00 04 00 00 00 b1 38 74 bd .............8t.(ACK     )
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [226]:14 00 00 00 ff 00 00 00 d6 00 00 00 2d 02 72 01 47 50 53 6d 61 70 20 33 37 38 20 53 59 53 20 53 6f 66 74 77 61 72 65 20 56 65 72 73 69 6f 6e 20 33 2e 37 30 00 56 45 52 42 4d 41 50 20 41 6d 65 72 69 63 61 73 20 41 75 74 6f 72 6f 75 74 65 20 57 65 61 74 68 65 72 20 42 61 73 65 6d 61 70 20 33 2e 30 30 00 56 45 52 53 4d 41 50 20 41 4a 4f 2c 20 41 5a 20 28 57 45 53 54 29 2c 20 41 4c 41 4d 4f 20 4c 41 4b 45 2c 20 41 5a 20 28 57 45 53 54 29 2c 20 41 4e 49 4d 41 53 2c 20 4e 4d 20 00 56 45 52 41 55 44 20 47 50 53 6d 61 70 20 32 37 36 43 2f 32 39 36 20 41 75 64 20 32 2e 32 30 00 56 45 52 53 50 4c 53 43 52 4e 20 47 50 53 6d 61 70 20 33 37 38 20 53 70 6c 61 73 68 20 32 2e 31 30 00 ..............r.GPSmap.378.SYS.Software.Version.3.70.VERBMAP.Americas.Autoroute.Weather.Basemap.3.00.VERSMAP.AJO..AZ..WEST...ALAMO.LAKE..AZ..WEST...ANIMAS..NM..VERAUD.GPSmap.276C.296.Aud.2.20.VERSPLSCRN.GPSmap.378.Splash.2.10.(PRDDAT  )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [55]:14 00 00 00 f8 00 00 00 2b 00 00 00 56 45 52 47 50 52 4f 4d 20 49 6e 6c 61 6e 64 20 44 65 74 61 69 6c 20 4d 61 70 20 77 69 74 68 20 52 6f 61 64 73 20 32 2e 30 30 00 ............VERGPROM.Inland.Detail.Map.with.Roads.2.00.(PRDEDA  )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [153]:14 00 00 00 fd 00 00 00 8d 00 00 00 50 00 00 4c 01 00 41 0a 00 54 01 00 41 64 00 44 6e 00 41 65 00 44 78 00 41 c9 00 44 ca 00 44 6e 00 44 d2 00 41 2d 01 44 38 01 44 2e 01 41 90 01 44 6e 00 41 f4 01 44 f5 01 41 58 02 44 58 02 41 59 02 44 59 02 41 bc 02 44 bc 02 41 20 03 44 20 03 41 22 03 44 22 03 41 84 03 41 86 03 41 87 03 41 88 03 41 89 03 44 84 03 41 91 03 44 91 03 41 8b 03 44 8b 03 44 8c 03 44 8d 03 44 8e 03 41 94 03 41 8c 03 44 8f 03 41 96 03 44 96 03 ............P..L..A..T..Ad.Dn.Ae.Dx.A..D..Dn.D..A..D8.D..A..Dn.A..D..AX.DX.AY.DY.A..D..A..D..A..D..A..A..A..A..A..D..A..D..A..D..D..D..D..A..A..D..A..D..(PRTARR  )
TX [12]:00 00 00 00 05 00 00 00 00 00 00 00 ............(SESREQ  )
RX (intr) [16]:00 00 00 00 06 00 00 00 04 00 00 00 b1 38 74 bd .............8t.(ACK     )
TX [12]:14 00 00 00 fe 00 00 00 00 00 00 00 ............(PRDREQ  )
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [64]:14 00 00 00 ff 00 00 00 d6 00 00 00 2d 02 72 01 47 50 53 6d 61 70 20 33 37 38 20 53 59 53 20 53 6f 66 74 77 61 72 65 20 56 65 72 73 69 6f 6e 20 33 2e 37 30 00 56 45 52 42 4d 41 50 20 41 6d 65 ..............r.GPSmap.378.SYS.Software.Version.3.70.VERBMAP.Ame(PRDDAT  )
RX (bulk) [4]:2e 32 30 00 .20.(PRDDAT  )
RX (bulk) [2]:30 00 0.(PRDDAT  )
RX (bulk) [58]:2e 31 74 6f 72 6f 75 74 65 20 57 65 61 74 68 65 72 20 42 61 73 65 6d 61 70 20 33 2e 30 30 00 56 45 52 53 4d 41 50 20 41 4a 4f 2c 20 41 5a 20 28 57 45 53 54 29 2c 20 41 4c 41 .1toroute.Weather.Basemap.3.00.VERSMAP.AJO..AZ..WEST...ALA(UNKNOWN )
RX (bulk) [4]:56 45 52 53 VERS(UNKNOWN )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [55]:14 00 00 00 f8 00 00 00 2b 00 00 00 56 45 52 47 50 52 4f 4d 20 49 6e 6c 61 6e 64 20 44 65 74 61 69 6c 20 4d 61 70 20 77 69 74 68 20 52 6f 61 64 73 20 32 2e 30 30 00 ............VERGPROM.Inland.Detail.Map.with.Roads.2.00.(PRDEDA  )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [153]:14 00 00 00 fd 00 00 00 8d 00 00 00 50 00 00 4c 01 00 41 0a 00 54 01 00 41 64 00 44 6e 00 41 65 00 44 78 00 41 c9 00 44 ca 00 44 6e 00 44 d2 00 41 2d 01 44 38 01 44 2e 01 41 90 01 44 6e 00 41 f4 01 44 f5 01 41 58 02 44 58 02 41 59 02 44 59 02 41 bc 02 44 bc 02 41 20 03 44 20 03 41 22 03 44 22 03 41 84 03 41 86 03 41 87 03 41 88 03 41 89 03 44 84 03 41 91 03 44 91 03 41 8b 03 44 8b 03 44 8c 03 44 8d 03 44 8e 03 41 94 03 41 8c 03 44 8f 03 41 96 03 44 96 03 ............P..L..A..T..Ad.Dn.Ae.Dx.A..D..Dn.D..A..D8.D..A..Dn.A..D..AX.DX.AY.DY.A..D..A..D..A..D..A..A..A..A..A..D..A..D..A..D..D..D..D..A..A..D..A..D..(PRTARR  )
TX [12]:14 00 00 00 fe 00 00 00 00 00 00 00 ............(PRDREQ  )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [226]:14 00 00 00 ff 00 00 00 d6 00 00 00 2d 02 72 01 47 50 53 6d 61 70 20 33 37 38 20 53 59 53 20 53 6f 66 74 77 61 72 65 20 56 65 72 73 69 6f 6e 20 33 2e 37 30 00 56 45 52 42 4d 41 50 20 41 6d 65 72 69 63 61 73 20 41 75 74 6f 72 6f 75 74 65 20 57 65 61 74 68 65 72 20 42 61 73 65 6d 61 70 20 33 2e 30 30 00 56 45 52 53 4d 41 50 20 41 4a 4f 2c 20 41 5a 20 28 57 45 53 54 29 2c 20 41 4c 41 4d 4f 20 4c 41 4b 45 2c 20 41 5a 20 28 57 45 53 54 29 2c 20 41 4e 49 4d 41 53 2c 20 4e 4d 20 00 56 45 52 41 55 44 20 47 50 53 6d 61 70 20 32 37 36 43 2f 32 39 36 20 41 75 64 20 32 2e 32 30 00 56 45 52 53 50 4c 53 43 52 4e 20 47 50 53 6d 61 70 20 33 37 38 20 53 70 6c 61 73 68 20 32 2e 31 30 00 ..............r.GPSmap.378.SYS.Software.Version.3.70.VERBMAP.Americas.Autoroute.Weather.Basemap.3.00.VERSMAP.AJO..AZ..WEST...ALAMO.LAKE..AZ..WEST...ANIMAS..NM..VERAUD.GPSmap.276C.296.Aud.2.20.VERSPLSCRN.GPSmap.378.Splash.2.10.(PRDDAT  )
Unit:	GPSmap 378 SYS Software Version 3.70
ID:	557
Version:	3.70RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [55]:14 00 00 00 f8 00 00 00 2b 00 00 00 56 45 52 47 50 52 4f 4d 20 49 6e 6c 61 6e 64 20 44 65 74 61 69 6c 20 4d 61 70 20 77 69 74 68 20 52 6f 61 64 73 20 32 2e 30 30 00 ............VERGPROM.Inland.Detail.Map.with.Roads.2.00.(PRDEDA  )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [153]:14 00 00 00 fd 00 00 00 8d 00 00 00 50 00 00 4c 01 00 41 0a 00 54 01 00 41 64 00 44 6e 00 41 65 00 44 78 00 41 c9 00 44 ca 00 44 6e 00 44 d2 00 41 2d 01 44 38 01 44 2e 01 41 90 01 44 6e 00 41 f4 01 44 f5 01 41 58 02 44 58 02 41 59 02 44 59 02 41 bc 02 44 bc 02 41 20 03 44 20 03 41 22 03 44 22 03 41 84 03 41 86 03 41 87 03 41 88 03 41 89 03 44 84 03 41 91 03 44 91 03 41 8b 03 44 8b 03 44 8c 03 44 8d 03 44 8e 03 41 94 03 41 8c 03 44 8f 03 41 96 03 44 96 03 ............P..L..A..T..Ad.Dn.Ae.Dx.A..D..Dn.D..A..D8.D..A..Dn.A..D..AX.DX.AY.DY.A..D..A..D..A..D..A..A..A..A..A..D..A..D..A..D..D..D..D..A..A..D..A..D..(PRTARR  )

Capability A10:
Capability A100: D110
Capability A101: D120
Capability A201: D202 D110 D210
Capability A301: D312 D302
Capability A400: D110
Capability A500: D501
Capability A600: D600
Capability A601: D601
Capability A700: D700
Capability A800: D800
Capability A802: D802
Capability A900:
Capability A902:
Capability A903:
Capability A904:
Capability A905: D900
Capability A913: D913
Capability A907: D907 D908 D909 D910
Capability A916:
Capability A908: D911
Capability A918: D918
Link_type 1  Device_command 0
Waypoint: Transfer 100 Type 110
Route:    Transfer 201 Header 202 Type 110
Track:    Transfer 301 Type 302
TX [14]:14 00 00 00 0a 00 00 00 02 00 00 00 32 00 ............2.(CMDDAT  Xfer PVT Stop)
RX (bulk) [0]:(RET2INTR)
usb_set_configuration failed, probably because kernel driver ''
 is blocking our access to the USB device.
For more information see http://www.gpsbabel.org/os/Linux_Hotplug.html

====== A segmentation fault ==============
sudo gpsbabel -D9 -i garmin -f usb: -o garmin -F test.loc
GPSBabel Version: 1.3.5 
TX [12]:00 00 00 00 05 00 00 00 00 00 00 00 ............(SESREQ  )
TX [12]:00 00 00 00 05 00 00 00 00 00 00 00 ............(SESREQ  )
TX [12]:00 00 00 00 05 00 00 00 00 00 00 00 ............(SESREQ  )
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [-110]:(UNKNOWN )
RX (intr) [16]:00 00 00 00 06 00 00 00 04 00 00 00 b1 38 74 bd .............8t.(ACK     )
TX [12]:14 00 00 00 fe 00 00 00 00 00 00 00 ............(PRDREQ  )
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [226]:14 00 00 00 ff 00 00 00 d6 00 00 00 2d 02 72 01 47 50 53 6d 61 70 20 33 37 38 20 53 59 53 20 53 6f 66 74 77 61 72 65 20 56 65 72 73 69 6f 6e 20 33 2e 37 30 00 56 45 52 42 4d 41 50 20 41 6d 65 72 69 63 61 73 20 41 75 74 6f 72 6f 75 74 65 20 57 65 61 74 68 65 72 20 42 61 73 65 6d 61 70 20 33 2e 30 30 00 56 45 52 53 4d 41 50 20 41 4a 4f 2c 20 41 5a 20 28 57 45 53 54 29 2c 20 41 4c 41 4d 4f 20 4c 41 4b 45 2c 20 41 5a 20 28 57 45 53 54 29 2c 20 41 4e 49 4d 41 53 2c 20 4e 4d 20 00 56 45 52 41 55 44 20 47 50 53 6d 61 70 20 32 37 36 43 2f 32 39 36 20 41 75 64 20 32 2e 32 30 00 56 45 52 53 50 4c 53 43 52 4e 20 47 50 53 6d 61 70 20 33 37 38 20 53 70 6c 61 73 68 20 32 2e 31 30 00 ..............r.GPSmap.378.SYS.Software.Version.3.70.VERBMAP.Americas.Autoroute.Weather.Basemap.3.00.VERSMAP.AJO..AZ..WEST...ALAMO.LAKE..AZ..WEST...ANIMAS..NM..VERAUD.GPSmap.276C.296.Aud.2.20.VERSPLSCRN.GPSmap.378.Splash.2.10.(PRDDAT  )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [55]:14 00 00 00 f8 00 00 00 2b 00 00 00 56 45 52 47 50 52 4f 4d 20 49 6e 6c 61 6e 64 20 44 65 74 61 69 6c 20 4d 61 70 20 77 69 74 68 20 52 6f 61 64 73 20 32 2e 30 30 00 ............VERGPROM.Inland.Detail.Map.with.Roads.2.00.(PRDEDA  )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [153]:14 00 00 00 fd 00 00 00 8d 00 00 00 50 00 00 4c 01 00 41 0a 00 54 01 00 41 64 00 44 6e 00 41 65 00 44 78 00 41 c9 00 44 ca 00 44 6e 00 44 d2 00 41 2d 01 44 38 01 44 2e 01 41 90 01 44 6e 00 41 f4 01 44 f5 01 41 58 02 44 58 02 41 59 02 44 59 02 41 bc 02 44 bc 02 41 20 03 44 20 03 41 22 03 44 22 03 41 84 03 41 86 03 41 87 03 41 88 03 41 89 03 44 84 03 41 91 03 44 91 03 41 8b 03 44 8b 03 44 8c 03 44 8d 03 44 8e 03 41 94 03 41 8c 03 44 8f 03 41 96 03 44 96 03 ............P..L..A..T..Ad.Dn.Ae.Dx.A..D..Dn.D..A..D8.D..A..Dn.A..D..AX.DX.AY.DY.A..D..A..D..A..D..A..A..A..A..A..D..A..D..A..D..D..D..D..A..A..D..A..D..(PRTARR  )
TX [12]:00 00 00 00 05 00 00 00 00 00 00 00 ............(SESREQ  )
RX (intr) [16]:00 00 00 00 06 00 00 00 04 00 00 00 b1 38 74 bd .............8t.(ACK     )
TX [12]:14 00 00 00 fe 00 00 00 00 00 00 00 ............(PRDREQ  )
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [64]:14 00 00 00 ff 00 00 00 d6 00 00 00 2d 02 72 01 47 50 53 6d 61 70 20 33 37 38 20 53 59 53 20 53 6f 66 74 77 61 72 65 20 56 65 72 73 69 6f 6e 20 33 2e 37 30 00 56 45 52 42 4d 41 50 20 41 6d 65 ..............r.GPSmap.378.SYS.Software.Version.3.70.VERBMAP.Ame(PRDDAT  )
RX (bulk) [4]:2e 32 30 00 .20.(ACK     )
RX (bulk) [2]:30 00 0.(PRDDAT  )
RX (bulk) [58]:2e 31 74 6f 72 6f 75 74 65 20 57 65 61 74 68 65 72 20 42 61 73 65 6d 61 70 20 33 2e 30 30 00 56 45 52 53 4d 41 50 20 41 4a 4f 2c 20 41 5a 20 28 57 45 53 54 29 2c 20 41 4c 41 .1toroute.Weather.Basemap.3.00.VERSMAP.AJO..AZ..WEST...ALA(UNKNOWN )
RX (bulk) [59]:56 45 52 53 14 00 00 00 f8 00 00 00 2b 00 00 00 56 45 52 47 50 52 4f 4d 20 49 6e 6c 61 6e 64 20 44 65 74 61 69 6c 20 4d 61 70 20 77 69 74 68 20 52 6f 61 64 73 20 32 2e 30 30 00 VERS............VERGPROM.Inland.Detail.Map.with.Roads.2.00.(UNKNOWN )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [153]:14 00 00 00 fd 00 00 00 8d 00 00 00 50 00 00 4c 01 00 41 0a 00 54 01 00 41 64 00 44 6e 00 41 65 00 44 78 00 41 c9 00 44 ca 00 44 6e 00 44 d2 00 41 2d 01 44 38 01 44 2e 01 41 90 01 44 6e 00 41 f4 01 44 f5 01 41 58 02 44 58 02 41 59 02 44 59 02 41 bc 02 44 bc 02 41 20 03 44 20 03 41 22 03 44 22 03 41 84 03 41 86 03 41 87 03 41 88 03 41 89 03 44 84 03 41 91 03 44 91 03 41 8b 03 44 8b 03 44 8c 03 44 8d 03 44 8e 03 41 94 03 41 8c 03 44 8f 03 41 96 03 44 96 03 ............P..L..A..T..Ad.Dn.Ae.Dx.A..D..Dn.D..A..D8.D..A..Dn.A..D..AX.DX.AY.DY.A..D..A..D..A..D..A..A..A..A..A..D..A..D..A..D..D..D..D..A..A..D..A..D..(PRTARR  )
TX [12]:14 00 00 00 fe 00 00 00 00 00 00 00 ............(PRDREQ  )
RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [226]:14 00 00 00 ff 00 00 00 d6 00 00 00 2d 02 72 01 47 50 53 6d 61 70 20 33 37 38 20 53 59 53 20 53 6f 66 74 77 61 72 65 20 56 65 72 73 69 6f 6e 20 33 2e 37 30 00 56 45 52 42 4d 41 50 20 41 6d 65 72 69 63 61 73 20 41 75 74 6f 72 6f 75 74 65 20 57 65 61 74 68 65 72 20 42 61 73 65 6d 61 70 20 33 2e 30 30 00 56 45 52 53 4d 41 50 20 41 4a 4f 2c 20 41 5a 20 28 57 45 53 54 29 2c 20 41 4c 41 4d 4f 20 4c 41 4b 45 2c 20 41 5a 20 28 57 45 53 54 29 2c 20 41 4e 49 4d 41 53 2c 20 4e 4d 20 00 56 45 52 41 55 44 20 47 50 53 6d 61 70 20 32 37 36 43 2f 32 39 36 20 41 75 64 20 32 2e 32 30 00 56 45 52 53 50 4c 53 43 52 4e 20 47 50 53 6d 61 70 20 33 37 38 20 53 70 6c 61 73 68 20 32 2e 31 30 00 ..............r.GPSmap.378.SYS.Software.Version.3.70.VERBMAP.Americas.Autoroute.Weather.Basemap.3.00.VERSMAP.AJO..AZ..WEST...ALAMO.LAKE..AZ..WEST...ANIMAS..NM..VERAUD.GPSmap.276C.296.Aud.2.20.VERSPLSCRN.GPSmap.378.Splash.2.10.(PRDDAT  )
Unit:	GPSmap 378 SYS Software Version 3.70
ID:	557
Version:	3.70RX (bulk) [0]:(RET2INTR)
RX (intr) [12]:00 00 00 00 02 00 00 00 00 00 00 00 ............(REQBLK  )
RX (bulk) [55]:14 00 00 00 f8 00 00 00 2b 00 00 00 56 45 52 47 50 52 4f 4d 20 49 6e 6c 61 6e 64 20 44 65 74 61 69 6c 20 4d 61 70 20 77 69 74 68 20 52 6f 61 64 73 20 32 2e 30 30 00 ............VERGPROM.Inland.Detail.Map.with.Roads.2.00.(PRDEDA  )
RX (bulk) [0]:(RET2INTR)
Segmentation fault