Myristoyl-binding protein that acts as a cargo adapter: specifically binds the myristoyl moiety of a subset of N-terminally myristoylated proteins and is required for their localization. Plays a key role in localization of proteins to the primary cilium membrane (By similarity). Adopts an immunoglobulin-like beta-sandwich fold forming a hydrophobic cavity that capture N-terminally myristoylated target peptides. Phe residues within the hydrophobic beta sandwich are required for myristate binding (By similarity). Belongs to the PDE6D/unc-119 family.