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Versioning
This article is considered accurate for the current version (1.56) of the game.
The Observation Bunker (also known as an OBS Bunker) is a player-built defensiveBunker modification that automatically gathers Map Intelligence for its faction when powered. It can also be entered in order to
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A radio bunker that provides intel to friendly units about the surrounding area. Reinforced with wood, it can withstand more punishment than a standard radio tower, and therefore is capable of increased effectiveness.
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— In-game description
Construction
It can be built on any Tier 2 Bunker with the following conditions:
A friendly soldier can enter the Bunker from underneath to be able to see very far (230 meters).
Intel Gathering
When it is powered with 1000W it automatically gathers Map Intelligence in a 130 meter radius, detecting players, vehicles, and structures, and broadcasts it to its faction. Its range is indicated on the map by a semi-transparent white circle around it.
Players can see their faction's intel on their map, but the intel displayed is only updated when they interact with a Base or if they have a Radio or Radio Backpack equipped.
The intel gathering is affected by:
Scout Uniform: players wearing one have an 80% chance of not being seen during each regular scan
Rain Storm: The scanning radius decreases depending on the storm intensity. At maximum intensity it is halved.
Frontier Border: Intel gathering structures stop working if they are within 220 meters of a contested border (a red line that shows up between two hexes).
Its range can be increased by adding certain Infrastructure Modifications of the "Garrison" type to the Bunker Base network it is connected to (+1% per infrastructure, +20% max). The maximum potential range is 156 meters at Tier 2. The increase isn't shown on the bunker's circle size on the map.
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A radio bunker that provides intel to friendly units about the surrounding area. Built from solid concrete, this reliable structure can push its effective range beyond lesser fortified radio structures.
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— In-game description
Construction
It can be built on any Tier 3 Bunker with the following conditions:
The Bunker Base must have unlocked the Observation Bunkers and Concrete Structures upgrade.
An existing Tier 2 Observation Bunker can also be upgraded to Tier 3 if it is connected (by trenches or bunkers) to a Bunker Base with the Concrete Structures upgrade. It's the cheaper method as you only spends Concrete Materials once overall.
As a concrete structure, it takes 24 hours to dry, during which it is more vulnerable the wetter it is.
The Tier 3 Observation Bunker modification slightly decreases the Structural Integrity of its bunker.
Defense
It is immune to small arms, fragmentation grenades, and 12.7mm machine gun fire. It's also pretty resistant to most explosives.
A friendly soldier can enter the Bunker from underneath to be able to see very far (230 meters).
Intel Gathering
When it is powered with 1000W it automatically gathers Map Intelligence in a 180 meter radius, detecting players, vehicles, and structures, and broadcasts it to its faction. Its range is indicated on the map by a semi-transparent white circle around it.
Players can see their faction's intel on their map, but the intel displayed is only updated when they interact with a Base or if they have a Radio or Radio Backpack equipped.
The intel gathering is affected by:
Scout Uniform: players wearing one have an 80% chance of not being seen during each regular scan
Rain Storm: The scanning radius decreases depending on the storm intensity. It is halved at max intensity.
Frontier Border: Intel gathering structures stop working if they are within 220 meters of a contested border (a red line that shows up between two hexes).
Its range can be increased by adding certain Infrastructure Modifications of the "Garrison" type to the Bunker Base network it is connected to (+1% per infrastructure, +20% max). The maximum potential range is 216 meters at Tier 3. The increase isn't shown on the bunker's circle size on the map.
Tactics
When comparing the Observation Bunkers to the Watchtower, they are more expensive, take longer to build, and have costlier upkeep in order to preventdecay (must be built with a Bunker Base and Engine Room). They also consume power to function, meaning you have to refuel the engine room every 48 hours with 2 cans of Diesel.
However, they are far more damage-resistant than regular Watchtowers and can see much farther. They are especially useful to watch region border areas since their range allows them to be placed outside the 150m fast decay area from the border and thus not need to be rebuilt every few hours. The longer range is also useful to watch a river (ship traffic) and the other side (enemy defenses).
OBS Bunker Spotting
The OBS Bunker can be entered the spotter's seat, which has a 230m viewing distance, making it a valuable asset for artillery by allowing players to aim an entire battery from the relative safety of a fortified position and at a greater range than is possible with binoculars. This is especially important if the artillery in question is meant to defend a coastline from enemy watercraft. Most vessels will be operating beyond the reach of most other weapons and possibly past the maximum range of binoculars as well.
Trivia
The Observation Bunker was added in Update 0.46 ('Entrenched'), which overhauled defenses. It is the second player-built structure in the game that players can build in order to provide map intelligence coverage.
The Spotter seat was added in Update 1.54 ('Naval Warfare') in order to give players a better way of spotting Large Ships, especially when doing them off of islands.
Gallery
A Tier 2 Observation Bunker owned by the Colonials
upgrade.
to the Bunker Base network it is connected to (+1% per infrastructure, +20% max). The maximum potential range is 156 meters at Tier 2. The increase isn't shown on the bunker's circle size on the map.
