Momentum investing revolves around the idea of following a stock's recent trend in either direction. In the 'long' context, investors will be essentially be "buying high, but hoping to sell even higher." With this methodology, taking advantage of trends in a stock's price is key; once a stock establishes a course, it is more than likely to continue moving that way. The goal is that once a stock heads down a fixed path, it will lead to timely and profitable trades.While many investors like to look for momentum in stocks, this can be very tough to define. There is a lot of debate surrounding which metrics are the best to focus on and which are poor quality indicators of future performance. The Zacks Momentum Style Score, part of the Zacks Style Scores, helps address this issue for us.Below, we take a look at Iridium Communications (IRDM), which currently has a Momentum Style Score of B. We also discuss some of the main drivers of the Momentum Style Score, like price change and earnings estimate revisions.It's also important to note that Style Scores work as a complement to the Zacks Rank, our stock rating system that has an impressive track record of outperformance. Iridium Communications currently has a Zacks Rank of #2 (Buy). Our research shows that stocks rated Zacks Rank #1 (Strong Buy) and #2 (Buy) and Style Scores of A or B outperform the market over the following one-month period.You can see the current list of Zacks #1 Rank Stocks here >>>Set to Beat the Market?Let's discuss some of the components of the Momentum Style Score for IRDM that show why this satellite phone company shows promise as a solid momentum pick.A good momentum benchmark for a stock is to look at its short-term price activity, as this can reflect both current interest and if buyers or sellers currently have the upper hand. It's also helpful to compare a security to its industry; this can show investors the best companies in a particular area.For IRDM, shares are up 13.07% over the past week while the Zacks Satellite and Communication industry is up 1.64% over the same time period. Shares are looking quite well from a longer time frame too, as the monthly price change of 10.42% compares favorably with the industry's 3.17% performance as well.While any stock can see its price increase, it takes a real winner to consistently beat the market. That is why looking at longer term price metrics -- such as performance over the past three months or year -- can be useful as well. Shares of Iridium Communications have increased 20.49% over the past quarter, and have gained 65.09% in the last year. In comparison, the S&P 500 has only moved 7.15% and 37.06%, respectively.Investors should also take note of IRDM's average 20-day trading volume. Volume is a useful item in many ways, and the 20-day average establishes a good price-to-volume baseline; a rising stock with above average volume is generally a bullish sign, whereas a declining stock on above average volume is typically bearish. Right now, IRDM is averaging 704,516 shares for the last 20 days.Earnings OutlookThe Zacks Momentum Style Score encompasses many things, including estimate revisions and a stock's price movement. Investors should note that earnings estimates are also significant to the Zacks Rank, and a nice path here can be promising. We have recently been noticing this with IRDM.Over the past two months, 3 earnings estimates moved higher compared to none lower for the full year. These revisions helped boost IRDM's consensus estimate, increasing from -$0.21 to -$0.10 in the past 60 days. Looking at the next fiscal year, 1 estimate has moved upwards while there have been no downward revisions in the same time period.Bottom LineTaking into account all of these elements, it should come as no surprise that IRDM is a #2 (Buy) stock with a Momentum Score of B. If you've been searching for a fresh pick that's set to rise in the near-term, make sure to keep Iridium Communications on your short list. Breakout Biotech Stocks with Triple-Digit Profit Potential The biotech sector is projected to surge beyond $2.4 trillion by 2028 as scientists develop treatments for thousands of diseases. They’re also finding ways to edit the human genome to literally erase our vulnerability to these diseases. Zacks has just released Century of Biology: 7 Biotech Stocks to Buy Right Now to help investors profit from 7 stocks poised for outperformance. Recommendations from previous editions of this report have produced gains of +205%, +258% and +477%. The stocks in this report could perform even better.See these 7 breakthrough stocks now>>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Iridium Communications Inc (IRDM): Free Stock Analysis Report To read this article on Zacks.com click here.