The last decade

UAVs or drones as referred to

have shown to be efficient in completing complex tasks when organized as Ad Hoc connected groups

thus forming a Flying Ad Hoc Network（FANET）.Although similar to Mobile Ad Hoc Network（MANET） and Vehicular Ad Hoc Network（VANET）

but

FANETs have their own characteristics.One of the main differences is the fact that UAVs in general

but particularly when organized are FANETs

are mission-based

and their mobility models are often dictated by the purpose of their mission and the nature of the task they plan to accomplish.Therefore

routing protocols for FANETs Particular Communication should take into consideration the nature of the applications and services that the UAVs are deployed for

and factor in the mobility models.However

designing routing protocols for FANETs Particular Communication is not an easy task given the highly dynamic topology of FANETs and the flying constraints they are subjected to.Compared to topology-based routing

position-based routing has demonstrated high efficiency and resilience to handle the high mobility of FANET nodes.To this end

in this paper

we propose a comprehensive survey of position-based routing protocols for FANETs with their various categories

it can be summarized as follows:classification of the most useful applications in FANETs;presentation of the main mobility models used by the proposed FANET routing protocols;description of the different routing techniques employed by the most popular routing protocols in FANETs;proposition of a new taxonomy of existing FANET routing protocols;depiction of some popular position-based routing protocols and recapitulation of all handled points using a comprehensive comparative study of all referenced routing protocols;summarization of all weak points distinguished in each discussed routing protocol.It reveals the various important relationships between the used strategies and limitations about each protocol.