Warning: This is 3.0 Edition material. It is possible that there is more recent 3.5 Edition version.
Inaccurate?

Improved Blindsight

(Savage Species)

Transmutation
Level: Druid 4, Sorcerer 4, Wizard 4, Cleric 5,
Components:

As blindsight, except as noted above and that the blindsight granted by the spell has a 60-foot range.