DeLorme PN-40

I have been using a PN40 for about 2 months now.

Originally I thought I'd sell my Garmin eTrex Vista HCX but now I am glad I did not.

The PN40 needs more polish. (That's a very short review isn't it.)

Software and maps for the PN-40

Topo 8.0

My first impression of the data was that it was not very accurate. When I have an aerial photo loaded, I can see myself walking right down the sidewalk in the photo but on the vector street overlay I'd be well off the edge of the road by several meters. This is because the streets are really a single line of vector data which is displayed with a width that is not accurate at that zoom level -- the displayed street would be perhaps 20' wide when in fact it's really probably 60'. So it looks off on the GPS screen.

Street Atlas 2009

I have a copy of SA 2009 and an LT40 USB GPS. As far as the PN-40 goes, forget it right now, you can't transfer Street Atlas data into the PN-40.

XMap 6.2

It's basically Topo 8 with some extra features. It lets you work with ESRI shapefiles by importing them.

USB to Serial

There is a program on the DeLorme site that you can use to take the live data coming in over USB and fan it out as one or more NMEA serial data streams. This means you can feed several client programs running on a Windows desktop machine at the same time. It also means you might not have to do anything at all with the binary protocol if you just want to get NMEA position data.

Binary protocol

The "DeLBin" (DeLorme Binary) Protocol spec is downloadable from the DeLorme forums as a PDF.

GPSbabel

July 2009 - Currently to get DeLBin support in gpsbabel you need to compile from cvs sources.

It seems to work fine on my Ubuntu desktop.

Here is a command to transfer waypoints from the PN-40 device to a GPX file.

sudo ./gpsbabel -i delbin -f usb -o gpx  -F test.gpx

(I used "sudo" because I have a permissions issue with the USB device that I should fix!)

Links -- GPSbabel home page and the GPSBabel DelBin page

Building gpsbabel from sources

http://sourceforge.net/projects/gpsbabel/develop

Login to server

cvs -d:pserver:[email protected]:/cvsroot/gpsbabel login

Checkout source code - this will create a gpsbabel directory right here.

cvs -z3 -d:pserver:[email protected]:/cvsroot/gpsbabel co -P gpsbabel

I needed to install one package to get the usb.h file.

apt-get install libusb-dev

Build and install

./configure
make 
sudo make install

Remove your old Ubuntu version if you have one.

sudo apt-get remove gpsbabel

(If you had the Unbuntu version installed then you should also tell the shell to forget about the old version by entering the command "hash -r".)

Now if you type "gpsbabel -h" at the command prompt you should get a lengthy list of supported formats that includes this block

delbin                DeLorme PN-20/PN-30/PN-40 USB protocol              
  get_posn              (0/1) Return current position as a waypoint       
  logs                  (0/1) Include groundspeak logs when writing       
  long_notes            (0/1) Use long waypoint notes regardless of PN ver

ArcMap support

You can buy the $250 ArcMap extension, I have a copy now and have tried it once or twice. You can move vector GIS data into the device and you can move data from the device into shapefiles without any extra steps. It seems very nice so far.

Jumping through some hoops, if you want to work with Topo 8 you can transfer track(s) from the PN-40 to a desktop, then in the Draw tab you can export the tracks as GPX data. Then you can convert the GPX files to ESRI shapefiles using DNR Garmin.