'Mad Money' Mailbag: Find Your Way in GPS

Editor's Note: The following are questions received from viewers of "Mad Money," seen every day at 6 p.m. EDT on CNBC.

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What is your opinion on Garmin(GRMN Quote) and how it relates to the rest of the sector, like Trimble Navigation(TRMB Quote) and Sirf Technology(SIRF Quote)?

-- Kathy from California

James J. Cramer: Hands down, Garmin and Sirf are the leaders in handheld GPS navigation devices. Both companies recently posted upbeat second-quarter earnings results, and I believe they'll continue to gather momentum in the next couple of quarters. On the other hand, I believe that investors should avoid Trimble.

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You said that Exxon(XOM Quote) lacked growth potential. What if the company simply spent the money it's using for its buyback?

-- John from Ohio

James J. Cramer: What you're talking about is the strategy that Chevron(CVX Quote) is employing with its $17.2 billion purchase of Unocal(UCL Quote). I can't say I agree with this direction, either. At this point of the energy cycle, I believe you need to stick with the explorers that have the best growth potential, like Chesapeake Energy(CHK Quote) and Southwestern Energy(SWN Quote).

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Want more Cramer? Check out Jim's rules and commandments for investing from his latest book by clicking here. Learn how to become a better investor. Get started now with the investing rules that Cramer lays out:

	1.	Pigs Get Slaughtered		2.	It's OK to Pay the Taxes
	3.	Don't Buy All at Once		4.	Buy Damaged Stocks
	5.	Diversify to Control Risk		6.	Do Your Homework
	7.	Don't Panic		8.	Buy Best-of-Breed
	9.	Defend Some Stocks		10.	Don't Bet on Bad Stocks
	11.	Own Fewer Names		12.	Cash Is for Winners
	13.	No Regrets		14.	Expect Corrections
	15.	Know Bonds		16.	Don't Subsidize Losers
	17.	No Room for Hope		18.	Be Flexible
	19.	Quit When Execs Do		20.	Patience Is a Virtue
	21.	Be a TV Critic		22.	When to Wait 30 Days
	23.	Beware the Hype		24.	Explain Your Picks
	25.	Find the Bull Market