Thou mayest be to us instead of eyes - A proverbial expression still in use in the East. Hobab would indicate the spots where water, fuel, and pasture might be found, or warn them of the dangers from hurricanes, and point out localities infested by robbers.
Related Commentaries of Numbers 10:31
Numbers 10:31
31 And he said, Leave us not, I pray thee; forasmuch as thou knowest how we are to encamp in the wilderness, and thou mayest be to us instead of eyes.