This is Sim International's package repository. To use it:

1. wget http://upd.sim-international.com/sim.sig
2. sudo mkdir -p /usr/local/share/keyrings/
3. sudo mv sim.sig /usr/local/share/keyrings/
4. echo "deb [signed-by=/usr/local/share/keyrings/sim.sig] http://upd.sim-international.com/${user} buster main" > /etc/apt/sources.list.d/${user}.list
5. echo "deb-src [signed-by=/usr/local/share/keyrings/sim.sig] http://upd.sim-international.com/${user} buster main" >> /etc/apt/souces.list.d/${user}.list (if your contract includes source deliveries)

On older distributions (Debian 10 and earlier):

1. Ask Sim International to issue a key file.
2. Save this keyfile to /etc/apt/auth.conf.d/${user}.conf
3. echo "deb http://upd.sim-international.com/${user} buster main" > /etc/apt/sources.list.d/${user}.list
4. echo "deb-src http://upd.sim-international.com/${user} buster main" >> /etc/apt/souces.list.d/${user}.list (if your contract includes source deliveries)
5. wget -O - http://upd.sim-international.com/sim.sig | sudo apt-key add -

Now you can:

• search for packages with the a320-, b737-, a330-, or sim- prefixes with apt search a320-
• Install binary packages with apt install a320-0.7
• Download source packages with apt source a320-0.7 (If your contract includes source deliveries)