Covert Surveillance is a art practiced by many different types of professionals such as PI's, Detectives, Police, Information Services and other Government agencies. Covert surveillance is broken down into different types:
Static and Mobile
Pretexted - Hidden in plain sight with a reasonable excuse
Hidden -Hidden behind a vehicle tint, curtain etc and not visible
Crowd - Part of a crowd of other people
Part - Become part of the activity, group etc through action
Static Pretexted, static hidden, static crow, static part, mobile pretexted, mobile hidden, mobile crowd & mobile part.
Pretexted static, part mobile, crowd mobile & hidden static are the primary categories 80% of your surveillance will fall into. By the far the most comfortable can be hidden static but this is not always the case at all, you will have to get out into the bad world form behind your limo tint. Remember what your doing changes!
Recording
To conduct surveillance successfully you will need to record what happens efficiently and discreetly. This includes photography. Each type of surveillance has different issues for recording what happens, remember your memory is fallible! Making accurate records is vital to good surveillance. Mobile phones are useful, however I prefer pen and paper when in the vehicle.
Ensuring you have methods of recording at all times is vital, covert video is not a mobile phone! Do not rely just on your mobile phone.
Brief comments on international operations
During international operation there are many factors to consider which change how you work substantially. I will break them down into segments:
Legal
Cultural
Physical
Speak
Pretext
Spy
Legal
changes mean what you can and cannot do can be different. Some countries are more relaxed and less likely to question your presence whereas others may be more suspicious of you, know your area and what you will need to prepare to look less suspicious THINK PRETEXT. Understand what the Police are likely to do with you in worst case scenarios and way up the risk vs reward.
Cultural, people don't behave in the same way everywhere. Don't rely on tactics that work in the UK to work abroad. Remember to consider the cultural changes. People won't stay in the sun for long in warmer climates, you need to account for different patterns of behaviour!
Physical
changes, things don't happen like they do the in the UK. From the shrubbery to deliveries at a business things don't happen in the same way. You may need to put in more hours or do more research.
Speak, learn the basics of the language. If you can get the words 'no', 'thank you' and other casual comments in the correct accent you can avoid suspicion in some situations. Remember also the opposite when researching areas speak to more people, you are not as familiar with the area and so talking with locals can help you target surveillance hours and locations more easily.
Pretext, you may need a pretext for the locals, your subject and for authorities. There is no easy pretext here if your carrying around expensive surveillance equipment. You must pre-text as a photographer, social media influencer or a companies PR department ideally to ensure your presence, equipment and other factors line up with your pretext.
Spy, you are a foreigner in this country, you are equipped with surveillance equipment, could you be accused of spying for another government? It sounds farfetched but the punishments can be severe so it is worth considering. I would avoid any politically unstable countries with little tourism due to this, however the job takes you where it takes you, be careful.