What Navy fans need to know as homecoming weekend kicks off. Who, when, where: Indiana (2-4, 0-3 Big Ten) at Navy (3-3), Saturday, 3:30 p.m. TV: CBS Sports Network (Grant Boone and Todd Christensen have the call. Gambling is illegal in most states: Navy is a 2.5-point favorite. Seriously, it’s illegal: Navy makes a rare appearance in the top spot of this handicapper’s picks column; he suggests an over/under of 60 points (a way to gamble on the point total; if you bet “over” 60 points and it’s 31-30, you win no matter which team wins) is too low for…