this is the launchctl plist file I used to run my .trackr script

.trackr.sh

#!/bin/bash

WIFISTAT=$(networksetup -getairportpower en1 | grep -o Off)

# this will turn on the wifi if need be and get the geolocaiton
# from CoreLocationCLI then turn the wifi back off if appropriate.
# CoreLocationCLIP seems to have a bug with -once where it pulls old gps
# data rather than the current data so I have to run it then kill it then
# run it with once to get the desired results.
if [ "$WIFISTAT" == "Off" ]; then
	networksetup -setairportpower en1 on
	sleep 10
	/Users/doug/.CoreLocationCLI &
	sleep 5
	killall .CoreLocationCLI
	GEOLOCATION=$(/Users/doug/.CoreLocationCLI -once)
	networksetup -setairportpower en1 off
else
	/Users/doug/.CoreLocationCLI & 
        sleep 5
        killall .CoreLocationCLI
	GEOLOCATION=$(/Users/doug/.CoreLocationCLI -once)
fi


{
echo -e "Current date & timestamp:"
date
# outputs lan and wan ip addresses to a file on dropbox.
echo -e "\nMy current external ip is:"
echo $(wget -q -O - http://www.whatismyip.com/automation/n09230945.asp)
echo -e "\nMy current internal ip info is:"
ifconfig
echo -e "\nMy geolocation:"
echo $GEOLOCATION
} > /Users/doug/Dropbox/Misc/location.log

# make sure you manually specify the key for scp so it will 
# know what to use when it is running as a daemon.
scp -i /Users/xxxx/.ssh/id_rsa  /Users/xxxx/Dropbox/Misc/location.log xxxx@xxxxxx.com:/location.txt

trackr launchctl plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>com.dberringer.trackr</string>
	<key>ProgramArguments</key>
	<array>
		<string>/Users/doug/.trackr.sh</string>
	</array>
	<key>RunAtLoad</key>
	<true/>
	<key>StartInterval</key>
	<integer>10800</integer>
</dict>
</plist>

trackr output

Current date & timestamp:
Thu Apr 14 16:03:40 PDT 2011

My current external ip is:
xxx.xxx.xxx.xxx

My current internal ip info is:
"your ifconfig data"

My geolocation:
<+38.xxxxxxxx, -122.xxxxxxxx> +/- 166.00m (speed -1.00 mps / course -1.00) @ 2011-04-13 16:03:40 -0700