Pi-Hole is a DNS based ad blocker. You can install it on a Debian based Linux distributions. To use it together with a PfSense firewall you need to change a few firewall settings:

  • Login to your PfSense and go to System -> General Setup:

In the first DNS Server field insert the IP of your Pi-Hole computer and save changes

  • Go to Services -> DNS Resolver:

Tick Enable DNS resolver

Tick Enable DNSSEC Support

Tick Enable Forwarding Mode (this will tell the PfSense to use a DNS server that we configured in a general settings in the previous step)

Save and that’s it.

This post will show you how to generate weather data from LA Crosse WS2300 series weather stations for submission to the APRS network.

APRS software I’m using is Xastir, but you can use this setup to push the weather data to other APRS applications also. Digipeater mode is already set up in Xastir. This post will not cover digipeating WX data.

1. Install packages

apt-get update

apt-get install  bc ncat unzip gcc build-essential

2. Download open2300 and compile fetch2300

Fetch2300 is part of open2300, it’s used to connect to the weather station and return the data. Credit goes to Kenneth Lavrsen (http://www.lavrsen.dk/foswiki/bin/view/Open2300)

wget -O "open2300-1-10.zip" https://sourceforge.net/projects/open2300/files/open2300/1.10/open2300-1.10.zip/download"

unzip open2300-1-10.zip

cd open2300-1.10

make fetch2300

cp fetch2300 /usr/local/bin/fetch2300

3. Edit  and rename open2300 config file named open2300-dist.conf or copy mine to /etc/open2300/open2300.conf

mkdir -p /etc/open2300

nano /etc/open2300/open2300.conf
SERIAL_DEVICE /dev/ttyUSB1 #/dev/ttyS0, /dev/ttyS1, COM1, COM2 etc
TIMEZONE 1 # Hours Relative to UTC. East is positive, west is negative
WIND_SPEED km/h # select MPH (miles/hour), m/s, or km/h
RAIN IN # Select mm or IN
PRESSURE hPa # Select hPa, mb or INHG

Note: make sure you select the correct SERIAL_DEVICE in the config. The station in my setup

is connected via USB to RS232 converter so the device is ttyUSB0. Also, don’t change the units, bash script will automatically convert them to be compatible with APRS network.

4. Copy bash script to desired location

mkdir -p /root/ws2300/

nano wxdata_v1.6.sh

#This script reads weather data via fetch program which is part of Open2300 suite written by Kenneth Lavrsen (http://www.
#It outputs the right data needed to feed Xastir for APRS weather reports. The scripts utilizes Ncat utility as server to
#serve the fetched output to Xastir.
#Fetched Data is pushed to Ncat server and then to Xastir. (Fetched data -> Ncat server -> Xastir)
#Ncat is part of Nmap, get it by installing Nmap.
#This script should work for LaCrosse weather stations, WS23xx series. Testing was done with WS2307.
#Written by S55MA and S56IUL, May 2016


#Start the Ncat server
chkncat=$(netstat -ant | grep $host:$port | grep -c LISTEN)
if [ "$chkncat" -ge "1" ]
echo "ncat already running, nothing to do"
nohup ncat -k -l --broker $host $port &>/dev/null &

#Start while loop
while true; do

echo "start `date`"

datetime=$(date '+%Y%m%d%H%M%S')
/usr/local/bin/fetch2300 $ws2300config > /tmp/wxdata-"$datetime".tmp
chkfile=$(ls -la $fetch_path | awk -F ' ' '{ print $5 }')

if [ "$chkfile" -le "43" ]
echo "No Data"
sleep 30
tempF=$(cat "$fetch_path" | grep To | grep -v 'min\|max\|DRtot\|TRtot' | awk '{print $2}')
temp1=$(echo "$tempF" | awk '{ printf ("%d\n",$1 + 0.5)}')
if [ "$temp1" -ge "99" ] || [ "$temp1" -le "-99" ]
if [ "$temp1" -le "-1" ]
if [ "$temp1" -ge "-9" ]
temp2=$(echo "$temp1" | sed 's/[-]//g')
temp=$(echo -0"$temp2")
temp2=$(echo "$temp1" | sed 's/[-]//g')
temp=$(echo -"$temp1")
temp=$(echo 0"$temp1")

windspeed2=$(cat "$fetch_path" | grep -m1 WS | grep -v 'min\|max\|DRtot\|TRtot'| awk '{print $2/1.609344}' | awk '{ printf ("%d\n",$1 + 0.5)}')
if [ "$windspeed2" -le "9" ]
windspeed=$(echo 00"$windspeed2")
if [ "$windspeed2" -le "99" ]
windspeed=$(echo 0"$windspeed2")
windspeed=$(echo "$windspeed2")

winddirection2=$(cat "$fetch_path" | grep DIR0 | awk '{print $2}' | sed 's/\..*$//')
if [ "$winddirection2" -le "9" ]
winddirection=$(echo 00"$winddirection2")
if [ "$winddirection2" -le "99" ]
winddirection=$(echo 0"$winddirection2")
winddirection=$(echo "$winddirection2")

rain1h=$(cat "$fetch_path" | grep R1h | grep -v 'min\|max' | awk '{print $2}' | sed 's/[.]//g')
rain24h=$(cat "$fetch_path" | grep R24h | grep -v 'min\|max' | awk '{print $2}' | sed 's/[.]//g')

airpressureR=$(cat "$fetch_path" | grep RP | grep -v 'min\|max' | awk '{print $2}')
airpressure2=$(echo "scale=1;$airpressureR / 1" | bc | sed 's/[.]//g')
if [ "$airpressure2" -le "9999" ]
airpressure=$(echo 0"$airpressure2")
airpressure=$(echo "$airpressure2")

relhumidity=$(cat "$fetch_path" | grep RHo | grep -v 'min\|max' | awk '{print $2}' | sed 's/\..*$//')

#Combine variables to forge Xastir string
printf "%s\n" "$xastir" | ncat --send-only $host $port
echo "$xastir"
sleep 3

rm -f /tmp/wxdata-*.tmp

echo "stop `date`"
echo "-----------------------------------"



If there are some formatting mistakes, the script is also available on pastebin: http://pastebin.com/29q8epF8

5. Start the script


You should see output similar to that:

start Tue May 3 00:36:47 CEST 2016

Leave the script running, open another terminal and check if ncat is getting data:

ncat localhost 1234

Wait a few seconds and you should get the result similar to that:


6. Go to Xastir and add the WX interface

Interface -> Interface Control -> Add -> Networked WX

WX Host:

WX Port: 1234

Save and start the interface.


7. Go to Xastir, View -> Own Weather Data

You should see your own weather data from the station


8. Start the script at boot and run it in background

Open /etc/rc.local and add

screen -d -m /root/ws2300/wxdata_v1.6.sh

Save and exit

Note: make sure you set your own path of the script location


My 5V RaspberryPi fan was very loud and annoying, so I wanted a solution to regulate the fan depending on the Pi temperature.

To achieve that, I used a mosfet switch, pulled out from an old computer motherboard, followed by some easy bash scripting.

Almost any mosfet from an old computer motherboard should work.




You can use any not used GPIO to connect the gate pin, in the picture above it’s #23.


I connected the mosfet pin to GPIO 19 in my case. You can choose  your own.


sudo apt-get update
sudo apt-get install bc

Enable selected GPIO pin, In my case, GPIO 19

echo "19" > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio19/direction

If you wan’t to select another GPIO and you already exported one GPIO, you need to unexport previous GPIO.

echo "19" > /sys/class/gpio/unexport

Bash script for controlling fan “speed”:

pico rpipwm.sh

Paste the script bellow, edit your GPIO pin and save:

#Poor man's PWM
#16.11.2015 by S55MA
#Quick and dirty script for controlling fan speed on RaspberryPI
#No rights reserved

#Define GPIO pin

while true; do

#Read temp
temp=$(cat /sys/class/thermal/thermal_zone0/temp | awk 'NR == 1 { print $1 / 1000}' | cut -c -4)

#If temperature is equal or lower than 39.99, the fan will stop spinning
if [[ $(bc <<< "$temp <= 39.99") == 1 ]] ;
$(echo "0" > /sys/class/gpio/gpio$pin/value)

#If temperature is between 40 and 42.99, the fan will start with 1 second burst and 1 second sleep
if [[ $(bc <<< "$temp >= 40 && $temp <= 42.99") == 1 ]] ;
$(echo "1" > /sys/class/gpio/gpio$pin/value; sleep 1; echo "0" > /sys/class/gpio/gpio$pin/value; sleep 1)

#If temperature is between 43 and 47.99, the fan will start with 1 second burst and 0.5 second sleep
if [[ $(bc <<< "$temp > 43 && $temp <= 47.99") == 1 ]] ;
$(echo "1" > /sys/class/gpio/gpio$pin/value; sleep 1; echo "0" > /sys/class/gpio/gpio$pin/value; sleep 0.5)

#If temperature is equal or higher than 48, the fan will start spinning constantly
if [[ $(bc <<< "$temp >= 48") == 1 ]] ;
$(echo "1" > /sys/class/gpio/gpio$pin/value)
sleep 0.1
chmod +x rpipwm.sh

Enable auto start at boot:

sudo cp rpipwm.sh /etc/init.d/rpipwm.sh
sudo chmod +x /etc/init.d/rpipwm.sh
sudo update-rc.d /etc/init.d/rpipwm.sh defaults

or you can use crontab:

crontab -e

Add and save:

@reboot /path/to/script/rpipwm.sh
sudo update-rc.d cron defaults

The rpisystat script will report the following system parameters to your LCD:

  • Internal IP
  • External IP
  • CPU temperature
  • GPU temperature
  • CPU usage
  • Memory usage
  • Free disk space
  • Incoming and outgoing network traffic

You need:

1. Breadboard with T-Cobbler (or connect the wires directly)
2. 16×2 LCD board
3. Adjustable resistor (potentiometer) for adjusting LCD contrast

1. Wiring (source: https://learn.adafruit.com/drive-a-16×2-lcd-directly-with-a-raspberry-pi/wiring):

Pin #1 of the LCD goes to ground (black wire)
Pin #2 of the LCD goes to +5V (red wire)
Pin #3 (Vo) connects to the middle of the potentiometer (orange wire)
Pin #4 (RS) connects to the Cobbler #25 (yellow wire)
Pin #5 (RW) goes to ground (black wire)
Pin #6 (EN) connects to Cobbler #24 (green wire)
Skip LCD Pins #7, #8, #9 and #10
Pin #11 (D4) connects to cobbler #23 (blue wire)
Pin #12 (D5) connects to Cobbler #17 (violet wire)
Pin #13 (D6) connects to Cobber #21 (gray wire)
Pin #14 (D7) connects to Cobber #22 (white wire)
Pin #15 (LED +) goes to +5V (red wire)
Pin #16 (LED -) goes to ground (black wire)


This schematics is for RaspberryPi 1 version, but you can connect to the same pins on RaspberryPi 2 (picture bellow).


2. Software

Download required packages:

sudo apt-get update
sudo apt-get install python-dev python-setuptools python-pip git
sudo easy_install -U distribute
sudo pip install rpi.gpio

Download my scripts:

sudo git clone git://github.com/s55ma/16-2-LCD-rpisystat.git
cd 16-2-LCD-rpisystat
sudo ./rpisystat.py

Make sure you edit rpisystat.py to match your GPIO pins (default is for the wiring above). Also edit rx.sh and tx.sh to match your network adapter.

Check the display in action: https://www.youtube.com/watch?v=5YkLTBd5-bw

Scripts: https://github.com/s55ma/16-2-LCD-rpisystat

References: https://learn.adafruit.com/drive-a-16×2-lcd-directly-with-a-raspberry-pi/wiring

In my previous post, I was writting about how to graph temperature and humidity from AM2302 sensor on RasberryPi. In addition, we will add dewpoint monitoring. We need two variables to calculate dewpoint, temperature and humidity. I took some already made scripts and combined them together to fit my needs. I wanted to calculate dewpoint completely with bash and bc, but since I’m to lazy, I just used the python script from this blog.

Get to the root shell (we don’t want to type sudo everytime):

sudo -s

Create python script (for dewpoint calculations):

pico /opt/dewpoint.py

Paste the code, save and exit (CTRL + C), Y, ENTER

import sys
import numpy as np

# approximation valid for
# 0 degC < T < 60 degC
# 1% < RH < 100%
# 0 degC < Td < 50 degC

# constants
a = 17.271
b = 237.7 # degC

# sys.argv[0] is program name

def dewpoint_approximation(T,RH):

    Td = (b * gamma(T,RH)) / (a - gamma(T,RH))

    return Td

def gamma(T,RH):

    g = (a * T / (b + T)) + np.log(RH/100.0)

    return g

Td = dewpoint_approximation(T,RH)
print Td

Make the script executable:

chmod +x /opt/dewpoint.py

Create plugin file:

pico /etc/munin/plugins/dewpoint

Paste the code, save and exit (CTRL + C), Y, ENTER


case $1 in
cat <<'EOM'
graph_title Dewpoint
graph_vlabel Celsius
graph_category AM2302
dewpoint.label Temperature
dewpoint.draw AREASTACK
dewpoint.colour 403075
exit 0;;

humidity=$(/opt/lol_dht22/loldht 7 | grep -i "humidity" | cut -d ' ' -f3)
temperature=$(/opt/lol_dht22/loldht 7 | grep -i "temperature" | cut -d ' ' -f7)

printf "dewpoint.value "
python /opt/dewpoint.py $temperature $humidity
chmod +x /etc/munin/plugins/dewpoint

Open munin-node file:

pico /etc/munin/plugin-conf.d/munin-node

Add the line at the end of the file, save and exit:


Restart services:

/etc/init.d/munin-node restart



  • RasberryPi 2
  • AM2302 humidity/temperature sensor
  • Some wires from old PCs to connect sensor with RaspberryPi


  • Raspbian OS
  • Nginx
  • Munin
  • WiringPi
  • Lol_dht22

1. Solder wires to the sensor like on the picture above, and connect them to the correct pins:

Pin 1 on the AM2302 to pin 1 (+3.3V) on the GPIO connector (labeled P1 on the raspi)
Pin 2 on the AM2302 to pin 7 (GPIO 4) on the GPIO connector
Pin 4 on the AM2302 to pin 9 (Ground) on the GPIO connector

For detailed instructions, check this blog up to step 4: https://hackaday.io/project/3766/instructions

All shell commands will be run as root, so I will not use sudo.

2. Install Nginx (web server)

apt-get update
apt-get install nginx php5-fpm

3. Install Munin

Muning is a monitoring tool for sysadmins. It creates graphs to monitor various parameters. We will configure munin to display AM2302 sensor in graphs.

apt-get install munin munin-node munin-plugins-extra

Edit munin configuration file:

pico /etc/munin/munin.conf
 use_node_name yes

4. Configure Nginx virtual host. Dynazoom will work with this config.

pico /etc/nginx/sites-enabled/default or pico /etc/nginx/sites-enabled/your.domain.com
server {
        listen 443 ssl;
        ssl_certificate /etc/nginx/ssl/your.domain.com.crt;
        ssl_certificate_key /etc/nginx/ssl/your.domain.com.key;
        server_name your.domain.com;
        root "/var/cache/munin/www/";
        auth_basic            "Private access";
        auth_basic_user_file  /etc/munin/munin_htpasswd;

        location ^~ /munin-cgi/munin-cgi-graph/ {
                fastcgi_split_path_info ^(/munin-cgi/munin-cgi-graph)(.*);
                fastcgi_param PATH_INFO $fastcgi_path_info;
                fastcgi_pass unix:/var/run/munin/spawn-fcgi-munin-graph.sock;
                include fastcgi_params;

        location /static/ {
                alias /etc/munin/static/;

5. Generate SSL cert

mkdir /etc/nginx/ssl
openssl req -subj '/CN=your.domain.com' -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/nginx/ssl/your.domain.com.key -out /etc/nginx/ssl/your.domain.com.crt

6. Generate website password

apt-get install apache2-utils
htpasswd -c /etc/munin/munin_htpasswd admin

You will be promted to enter a new password.

7. Add common modules to munin

cd /usr/share/munin/plugins
wget -O pisense_ https://raw.github.com/perception101/pisense/master/pisense_
chmod a+x pisense_
ln -s /usr/share/munin/plugins/pisense_ /etc/munin/plugins/pisense_temp
ln -s /usr/share/munin/plugins/pisense_ /etc/munin/plugins/pisense_clock
pico /etc/munin/plugin-conf.d/munin-node
user root

8. Configure AM2302 prerequisites

apt-get install git-core
cd /opt/
git clone git://git.drogon.net/wiringPi
cd wiringPi
cd /opt/
git clone https://github.com/technion/lol_dht22
cd lol_dht22

9. Create plugins for munin

pico /etc/munin/plugins/DHT22-humidity

case $1 in
 cat <<'EOM'
graph_title Relative humidity
graph_vlabel Percent
graph_category AM2302
humidity.label RH
humidity.draw AREASTACK
humidity.colour 3E9BFB
 exit 0;;

printf "humidity.value "
/opt/lol_dht22/loldht 7 | grep -i "humidity" | cut -d ' ' -f3
chmod +x /etc/munin/plugins/DHT22-humidity
pico /etc/munin/plugins/DHT22-temperature

case $1 in
 cat <<'EOM'
graph_title Temperature
graph_vlabel Celsius
graph_category AM2302
temperature.label Celsius
temperature.label Temperature
temperature.draw AREASTACK
temperature.colour 00FF00
 exit 0;;

printf "temperature.value "
/opt/lol_dht22/loldht 7 | grep -i "temperature" | cut -d ' ' -f7
chmod +x /etc/munin/plugins/DHT22-temperature
pico /etc/munin/plugin-conf.d/munin-node

Add this to the end of the file:

user root

10. Enable Dynazoom for graphs

apt-get install spawn-fcgi libcgi-fast-perl
pico /etc/init.d/munin-fastcgi
#! /bin/sh

# Provides: spawn-fcgi-munin-graph
# Required-Start: $all
# Required-Stop: $all
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Description: starts FastCGI for Munin-Graph
# --------------------------------------------------------------
# Munin-CGI-Graph Spawn-FCGI Startscript by Julien Schmidt
# eMail: munin-trac at julienschmidt.com
# www: http://www.julienschmidt.com
# --------------------------------------------------------------
# Install: 
# 1. Copy this file to /etc/init.d
# 2. Edit the variables below
# 3. run "update-rc.d spawn-fcgi-munin-graph defaults"
# --------------------------------------------------------------
# Special thanks for their help to:
# Frantisek Princ
# Jérôme Warnier
# --------------------------------------------------------------
# Last Update: 14. February 2013
# Please change the following variables:

DAEMON_OPTS="-s $SOCK_FILE -F $FCGI_WORKERS -U $SOCK_USER -u $FCGI_USER -g $FCGI_GROUP -P $PID_FILE -- /usr/lib/munin/cgi/munin-cgi-graph"

# --------------------------------------------------------------
# No edits necessary beyond this line
# --------------------------------------------------------------

if [ ! -x $DAEMON ]; then
 echo "File not found or is not executable: $DAEMON!"
 exit 0

status() {
 if [ ! -r $PID_FILE ]; then
 return 1
 for FCGI_PID in `cat $PID_FILE`; do 
 if [ -z "${FCGI_PID}" ]; then
 return 1
 FCGI_RUNNING=`ps -p ${FCGI_PID} | grep ${FCGI_PID}`
 if [ -z "${FCGI_RUNNING}" ]; then
 return 1
 return 0
start() {
 if status; then
 echo "FCGI is already running!"
 exit 1

stop () { 
 if ! status; then
 echo "No PID-file at $PID_FILE found or PID not valid. Maybe not running"
 exit 1
 # Kill processes
 for PID_RUNNING in `cat $PID_FILE`; do
 kill -9 $PID_RUNNING
 # Remove PID-file
 rm -f $PID_FILE
 # Remove Sock-File
 rm -f $SOCK_FILE

case "$1" in
 echo "Starting $NAME: "
 echo "... DONE"

 echo "Stopping $NAME: "
 echo "... DONE"

 echo "Stopping $NAME: "
 echo "Starting $NAME: "
 echo "... DONE"
 if status; then
 echo "FCGI is RUNNING"
 echo "Usage: $0 {start|stop|force-reload|restart|status}"
 exit 1

exit 0
chmod 755 /etc/init.d/munin-fastcgi
update-rc.d munin-fastcgi defaults
/etc/init.d/munin-fastcgi start

11. Restart daemons and visit your munin site


/etc/init.d/nginx restart

/etc/init.d/munin-node restart

Go to https://your.domain.com/munin/


Check how to add dewpoint graph on my next post.



My HW/SW setup:

Dongle: SDR USB Dongle (Realtek RTL2832U R820T chipset, other SDR dongles may also work). Search Ebay for RTL2832U dongles. They should all work.

OS: Windows 7, 64bit

Capture software: SDR# from sdrsharp.com

Decoder: AFSK1200

Note: Don’t install any software drivers that came with the SDR Dongle. Uninstall the drivers, if you already installed them.

1. Setup stereo mix:

Stereo mix is used to forward output sound to the microphone input. We need this, because AFSK1200 decoder will be listening to the microphone input. Open sound options in control panel or just go to start and enter mmsys.cpl. Using USB headset will not work, you need analog speakers. There are some workarounds to use USB headsets but I haven’t tried them yet.

Playback tab: set speakers to the default device.


Recording tab: if you don’t see the “Stereo mix device”, it’s probably hidden.

  • Right click anywhere in the field where devices are listed and tick “Show disabled devices“, “Show disconnected devices. Stereo mix shold be available now.
  • Right click on it and select “Enable“.


2. Download  and configure SDR# software:

  • Download http://sdrsharp.com/downloads/sdr-install.zip
  • Extract it and run install.bat
  • Plug in your SDR dongle, go to sdrsharp folder and run zadig.exe. Go to Options and tick “List all devices“. Select “Bulk-In, Interface (Interface 0)” and click “Install Driver”. (On my screenshot, you can see “Reinstall Driver, because I already installed it). Note: You will need to install driver again if you replug the dongle in another USB port.


  • Run SDRSharp.exe
  • Source -> RTL-SDR (USB)
  • Radio -> NFM, enable Squelch and set it between 50 and 80, you can increase or decrease it depending on your surrounding environment
  • Frequency Manager -> New -> add the frequency you want to monitor, in my case it’s 144.800 Mhz.
  • Click on Play button at the top of SDR# You will see spikes when something is transmitting on the frequency


3. Decode packets with AFSK 1200 Decoder:

  • Download AFSK 1200 Decoder
  • Select Input and choose Stereo mix
  • Click play button. You are now decoding APRS packets


Don’t forget to disable stereo mix and set the default playback device as you had before when you finish decoding.

I used my RaspberryPI to setup an APRS digipeater. The software I used is called Xastir. The problem is, there are no good default maps to use in Xastir.

This tutorial will guide you how to install OSM maps into Xastir software. Maps are generated on a Windows machine, then transferred to a Linux machine where Xastir is running.

TL;DR version:

1. Download Taho application for Windows.

2. Select area, copy bbox text.

3. Paste bbox text to Taho, click on bbox button, select parameters and click on make maps.

4. Upload generated .inf and .jpg files to your Xastir map folder.

5. Download inf2geo.pl to your linux machine and convert .inf files to .geo files.

6. Start or restart Xastir, select your map and apply.


Detailed version:

1. Download Taho application for Windows (Version 4.01 didn’t work on my PC, you should download older versions, if you can’t run the newest version).

2. When you launch the Taho application, it will also open the bbox tool site.

3. On the bbox tool site, center map to your desired location and click button “select area”. Select your area.

Note: If you select too big area, you won’t be able too select top zoom levels in the next steps.


4. Copy code in the grey box to your clipboard.



5. Open Taho application and paste the code into “Get from <bbox…>” field. Click on the bbox button now. It should populate coordinates into Taho application. Select UI-View in Kal.-Files, .jpg for file type, zoom level (16 is good for small city), size (should be free, whole area in 1 file), define path for saving your maps and click on make maps button.



6. Each selected zoom level generates separate .jpg and .inf files in your defined maps path (step above).

7. Xastir doesn’t know how to handle .inf files so we need to convert them to .geo format. Upload your .jpg and .inf files to Xastir map folder. In my case, maps are located in  /usr/share/xastir/maps Fire up your linux console and

Download inf2geo.pl converter and convert .inf files:

sudo cd /usr/share/xastir/scripts
sudo wget https://raw.githubusercontent.com/mgrennan/xastir/master/scripts/inf2geo.pl
sudo chmod +x inf2geo.pl
sudo ./inf2geo.pl /usr/share/xastir/maps/yourmap.inf

By now, you should have yourmap.geo file in /usr/share/xastir/maps
Open .geo file with your favourite editor and correct the path if you have to.

FILENAME    maps/yourmap.jpg
TIEPOINT    0           0       16.0645 45.8288333333333
TIEPOINT    5631        5887    14.661666666667        46.8525
IMAGESIZE   5632        5888
# Converted from a .INF file by WE7U's inf2geo.pl script

Note: If you change the name of the file, you also have to change FILENAME in yourmap.geo accordingly.

8. Start or restart Xastir, go to Map -> Map Chooser -> select your map -> Apply -> profit.