Locus Map is growing. Over the years of development, it contains more and more features that require permission from the Android Operation System. The same it is with apps related to it or built upon its base - Locus GIS, Map4Trip and KiMaps. The main reason for it is, of course, your protection as the user.
A list of all available permissions for Android platform is here - as you can see bellow, Locus Map group of apps uses only a few of them.
A complete list of all the permissions and their explanation: