Yeah, but it wouldn't be a spidey-tracer if you had to use a skill roll.
I might build it as Detect: People I've Tagged With A Spider-Tracer. Give it a range of 1-2 miles, Requires A Skill Roll to tag someone with it, IAF, 1 charge lasting about 2 days... instead of focusing the power on the tracer, focus it on the character. The tracer is a special effect.
That was more or less the design I had at one point, but everybody else in the campaign insisted there had to be an object...!
But I am considering revising the character for the odd convention game, so I may go this route (esp. since it may never come up at all!).