You are welcome with your UAV in Latvia.
Maximum take-off weight: No limit
Maximum hight: 120 meters / 393 ft.
Maximum horizontal distance: Keep visual contact with UAV at all times.
Other distances: Keep 50 meters away from people, animals, vehicles, explosive objects
Insurance: Not known
Metal props: Strictly Prohibited!
Distance Airports / Heliports: 10 km / 6.4 mi.
Night flights: Prohibited
Prohibited: Not above buildings, bridges, railways, roads, electricity pylons, crowds, prisons, cemeteries,
churches and military infrastructure. Stay here at least 200 meters away.
Good to know: UAVs must be equipped with an automatic landing module, and a return to home. (Failsafe function).
Useful link: Latvia Civil Aviation Authority (LCAA)
Contact information: firstname.lastname@example.org / + 371 678 309 36