Mars rover algorithm

loop{

Move straight or back randmly (random seconds)

Trun randomly left or right randomly with differential turning of 4wd motor(random seconds)

}

WOuld be a gaussian probability to find bot from center of release...

Cheapest autonomous bot proposal add sensors if please

Can make 1 billion cheap toy..

You can add 1 hr later second layer motion for full surveylance of mars..