From CloudModding OoT Wiki
Actor 0x011B
ovl_Elf_Msg
Version VRom VRam Size
Debug 00D66150 00D66D30 {{{ram-start}}} {{{ram-end}}} BE0
NTSC 1.0 00DF8930 00DF8F20 {{{ram-start}}} {{{ram-end}}} 5F0
PAL MQ 00D0F3B0 00D0F9A0 {{{ram-start}}} {{{ram-end}}} 5F0

ovl_Elf_Msg is the Navi infospot actor. It's purpose is to display text dialogs with an id of 0x01xx. It is similar in behavior to actor ovl_Elf_Msg2 (0173, Navi Information Spot (Targetable))