What is the expected increase in SG&A expenses for the full year 2021 
e all primarily focused on their core initial, say, commodity, consumer service, but they all have told us they find a lot of value and interest in our services as a complement to them. So I think I know that you'll see the products coming for a couple of years.
As far as AST space mobile, yeah, I've noticed that as well. Certainly, it's one of these big ideas that frankly has a lot of invention still to go. We and our predecessor company dismissed the -- trying to do what they're doing has been way too complicated and hard. It would -- it requires -- if you think that what we've done over the last 30 years to get to the point we've done has been hard, you can kind of ratchet that up in order of magnitude or maybe several order of magnitudes for what they have said that they are just going to try to accomplish. The science involved in developing that is going to be expensive, takes a long time. And it's certainly interesting if they're able to accomplish it but I think more is that I'm viewing AST as a indicative of the market enthusiasm in space right now in terms of how they're being valued and considered by the market is then really indicative of whether they are -- what their claim and they'll be able to do in the timeframe, they'll be able to do for the price [Indecipherable] able to do is in any way valid. Hope that helps.
Ric Prentiss -- Raymond James -- Analyst
Great. It does. Appreciate that. And I look forward to quote seeing you guys in May. Thanks guys.
Matthew J. Desch -- Chief Executive Officer
Yeah, thanks Ric.
Thomas J. Fitzpatrick -- Chief Financial Officer
Thanks, Ric.
Operator
Our next question comes from Greg Burns from Sidoti & Company. Please go ahead with your question.
Gregory Burns -- Sidoti & Company -- Analyst
Tom, you mentioned SG&A stepping up a bit this year, is the fourth quarter a good run rate?
Thomas J. Fitzpatrick -- Chief Financial Officer
Total step -- the fourth quarter a good run rate. I would think about SG&A being up in 2021 a few million dollars, Greg, on the full year.
Gregory Burns -- Sidoti & Company -- Analyst
Okay. All right. Thanks. And then in terms of your GMDSS product, how does that compare to [Indecipherable] solutions out there? And is that being positioned as a stand-alone product [Indecipherable] drive revenue or is it more of service that will pull through your other broadband services? Thanks.
Matthew J. Desch -- Chief Executive Officer
Yeah, I think I'm not sure everybody heard your question, but it was I think our GMDSS service or maritime GMDSS, is it being viewed as a stand-alone product or something to pull through the rest of our services? It's both. It's always been -- it's been an area that we've not been able to address at all. It's not the narrowband product that we have today when it's used in a emergency perspective. That doesn't bring revenues. It's all the other uses of that terminal that go on, from delivering maritime safety data and navigation data and the use of it for ships business. And that terminal had to be on every ship out there at least all the SOLAS-class ships, and that always had to be from our competitor. So we were always kind of competing for the other terminals on board. Now a ship can be an Iridium only ship and that's -- our partners are excited about that because they haven't always enjoyed competing with delivering a service of a competitor since they were often providing the VSAT service as well. So it can be a stand-alone service. As I've mentioned in my comments, we're kind of really enthusiastic about the fact that this might expand the market for GMDSS. There is hundreds of thousands of ships out there who would love to have a panic button at a low price that connects with all the regional emergency centers and provides information, but it really wasn't very cost effective before. And I mean, we're even wondering if say, insurance companies and others might not be very attracted to encouraging those ship owners to use an Iridium GMDSS service. So hope that helps.
Gregory Burns -- Sidoti & Company -- Analyst
Okay, thanks.
T
e all primarily focused on their core initial, say, commodity, consumer service, but they all have told us they find a lot of value and interest in our services as a complement to them. So I think I know that you'll see the products coming for a couple of years.
As far as AST space mobile, yeah, I've noticed that as well. Certainly, it's one of these big ideas that frankly has a lot of invention still to go. We and our predecessor company dismissed the -- trying to do what they're doing has been way too complicated and hard. It would -- it requires -- if you think that what we've done over the last 30 years to get to the point we've done has been hard, you can kind of ratchet that up in order of magnitude or maybe several order of magnitudes for what they have said that they are just going to try to accomplish. The science involved in developing that is going to be expensive, takes a long time. And it's certainly interesting if they're able to accomplish it but I think more is that I'm viewing AST as a indicative of the market enthusiasm in space right now in terms of how they're being valued and considered by the market is then really indicative of whether they are -- what their claim and they'll be able to do in the timeframe, they'll be able to do for the price [Indecipherable] able to do is in any way valid. Hope that helps.
Ric Prentiss -- Raymond James -- Analyst
Great. It does. Appreciate that. And I look forward to quote seeing you guys in May. Thanks guys.
Matthew J. Desch -- Chief Executive Officer
Yeah, thanks Ric.
Thomas J. Fitzpatrick -- Chief Financial Officer
Thanks, Ric.
Operator
Our next question comes from Greg Burns from Sidoti & Company. Please go ahead with your question.
Gregory Burns -- Sidoti & Company -- Analyst
Tom, you mentioned SG&A stepping up a bit this year, is the fourth quarter a good run rate?
Thomas J. Fitzpatrick -- Chief Financial Officer
Total step -- the fourth quarter a good run rate. I would think about SG&A being up in 2021 a few million dollars, Greg, on the full year.
Gregory Burns -- Sidoti & Company -- Analyst
 Okay. All right. Thanks. And then in terms of your GMDSS product, how does that compare to [Indecipherable] solutions out there? And is that being positioned as a stand-alone product [Indecipherable] drive revenue or is it more of service that will pull through your other broadband services? Thanks.
Matthew J. Desch -- Chief Executive Officer
Yeah, I think I'm not sure everybody heard your question, but it was I think our GMDSS service or maritime GMDSS, is it being viewed as a stand-alone product or something to pull through the rest of our services? It's both. It's always been -- it's been an area that we've not been able to address at all. It's not the narrowband product that we have today when it's used in a emergency perspective. That doesn't bring revenues. It's all the other uses of that terminal that go on, from delivering maritime safety data and navigation data and the use of it for ships business. And that terminal had to be on every ship out there at least all the SOLAS-class ships, and that always had to be from our competitor. So we were always kind of competing for the other terminals on board. Now a ship can be an Iridium only ship and that's -- our partners are excited about that because they haven't always enjoyed competing with delivering a service of a competitor since they were often providing the VSAT service as well. So it can be a stand-alone service. As I've mentioned in my comments, we're kind of really enthusiastic about the fact that this might expand the market for GMDSS. There is hundreds of thousands of ships out there who would love to have a panic button at a low price that connects with all the regional emergency centers and provides information, but it really wasn't very cost effective before. And I mean, we're even wondering if say, insurance companies and others might not be very attracted to encouraging those ship owners to use an Iridium GMDSS service. So hope that helps.
Gregory Burns -- Sidoti & Company -- Analyst
Okay, thanks.
T