Roger Kuebel
Analyst · Raymond James
Thanks, Brent. As Brent mentioned earlier, our second quarter revenue came in at $41.8 million compared to $43.4 million recorded in the second quarter of 2021. Our consolidated gross profit margin was 37% for the second quarter as compared with 35% in the second quarter of last year. Revenue from our mobile connectivity segment increased $0.8 million with a gross margin of 41%, up 7 percentage points. Revenue from our inertial navigation segment decreased $2.3 million year-over-year, with gross margin decreasing 24 percentage points to 16%.
Service revenue for the second quarter was $28.3 million, an increase of $2.2 million or 8% from $26.1 million in the second quarter of last year. By segment, service revenue in mobile connectivity increased by $2.2 million or 9%. This increase was primarily due to a $2.7 million increase in mini-VSAT Broadband airtime revenue. As Brent noted, airtime revenue grew to approximately $25.8 million or approximately 12% over the second quarter of last year despite a 1% decrease in active subscribers as a result of the shutdown of our legacy network on December 31, 2021.
Total subscribers, which includes those who are temporarily suspended, was up 1%. As a reminder, suspended subscribers are typically recreational customers who aren't using their boats during the colder months. While we refer to them as suspended, they all still have access to voice services for which they pay by the minute. In addition, Agile customers who suspend also pay a modest monthly fee for the equipment that KVH owns that is on their vessels.
Airtime gross margin was 43%, which is up 8 percentage points from a year ago. This increase is due to a combination of factors but is primarily driven by the shutdown of the legacy network.
Product revenue for the second quarter was $13.6 million, a decrease of $3.7 million or 21% from $17.3 million in the second quarter of the prior year. By segment, mobile connectivity decreased by $1.4 million or 18%, primarily due to a decrease in VSAT product sales. This decline was partially due to a large number of units shipped last year to customers migrating from our legacy network to our new HTS network. However, we also saw some softening in demand compared to the very high shipments to new customers that we saw last year. Inertial navigation product revenue decreased approximately $2.3 million or 25%. This was driven by a $1.1 million drop in FOG sales, which was entirely due to supply chain constraints, as well as a $1.2 million decline in TACNAV and other products.
Operating expenses for the quarter were $17.6 million, down $3.5 million from the second quarter of last year. However, both this year and last, we had a significant amount of nonrecurring expenses in the second quarter. Last year, we had a $2.7 million increase in legal costs related to our proxy contest, and this year, we had a total of $1.1 million related to our reduction in force and the searches for a new CEO and Board members. As such, even on a recurring basis, this quarter was $1.9 million less than the second quarter of last year.
At the operating income level, the changes in revenue, margins and operating expenses resulted in a loss from operations of $2.3 million, which was an improvement of $3.5 million compared with a $5.8 million loss recorded in the second quarter of 2021. This loss includes the $1.1 million in nonrecurring OpEx I just mentioned as well as a $1.6 million reserve for inventory. As such, if you adjust for all those recurring items -- or nonrecurring items, you'll find that we would have had a profitable quarter, and that was without any large TACNAV sales.
Looking at our individual segments. Our mobile connectivity segment generated an operating profit of $4.5 million compared with an operating profit of $0.6 million last year, while our inertial navigation segment had an operating loss of $1.3 million for the quarter, which included the $1.6 million inventory reserve versus an operating profit of $0.6 million last year. Our unallocated loss was $5.6 million compared to last year's $7.0 million.
For the second quarter, our net loss was $1.4 million compared with a net loss of $5.7 million recorded in the same quarter last year. On a non-GAAP basis, which excludes amortization of intangibles, stock-based compensation, another nonrecurring cost such as unusual nonoperating fees, foreign exchange transaction gains and losses, employee termination costs, the CEO separation, related tax effects and changes in our valuation allowance and other tax adjustments, after those adjustments, we had net income of $0.8 million compared with a net loss of $0.8 million last year.
EPS for the second quarter was a net loss of $0.08 per share compared with a net loss of $0.31 per share in the same period last year. Non-GAAP EPS for the second quarter was $0.04 per share compared to a non-GAAP EPS loss of $0.05 per share last year. Our non-GAAP adjusted EBITDA for the quarter was a positive $4.1 million compared with a positive $1.5 million in the second quarter of last year. For a complete reconciliation of our non-GAAP measures, please refer to the earnings release that was published earlier this morning.
Net cash provided by operations was $0.3 million compared to $0.2 million used in operations in the second quarter of last year. Capital expenditures for the quarter were $3.6 million. Cash proceeds from the sale of the radio business was $2.4 million, and cash provided by financing activities was $84,000, resulting in an ending cash balance of $16 million.
Looking ahead and with our focus on mobile connectivity, we expect mobile connectivity revenue growth between 6% and 9% on a pro forma basis adjusted for the sale of the radio business and adjusted EBITDA for the company to be between $11 million and $15 million, assuming that supply chain issues don't worsen. Even after the sale of the inertial navigation business, we are still expecting a significantly reduced operating loss for the second half of the year and continued progress towards profitability with the upper range of our expectation being a breakeven scenario.
This concludes our prepared remarks. I will now turn the call over to the operator to open the line for the Q&A portion of the call. Lisa?