Honestly, there's good reasoning to give him the full suite of Inhuman Speed/Strength/Toughness/Recovery as well. In most of the comic runs he was depicted as having low superhuman levels of speed and strength especially. But that's a ton of refresh.
I'd also say that a -2 refresh Supernatural Senses suite would work well. Echolocation is the big one, but also remember that he has an extremely refined sense of touch and smell as well.
Honestly, here's what you'd need for his iconic power.
Supernatural Senses [-3]
Broad Senses: You have perfect echolocation, allowing you to function perfectly in total darkness. Your other four senses (touch, taste, hearing, smell) are also inhumanly acute, allowing you to make assessments and declarations based on subtle scent clues.
I'd strongly argue that he also has at least Inhuman Speed for another -2 refresh. I'd also allow Inhuman Strength and Toughness as well.