The title of your post asks about Sirius???
But, the body of your post asks about XM??
While Sirius and XM are now owned by the same company, and are called "Sirius XM", please note that they have two totally different satellite constellations, with totally different orbits.
.(and as of 2 years ago totally different weather offerings.)
I've made my living running my own communications
and consulting firm, specializing in sat comm...so satellite
coverage and link budgets is what I've done for > 30 years now!!
So, here's the straight skinny!
Sirius is by far the better of the two for marine
weather info/data, and also for widest coverage....(but, there are other/better options)
And, please watch these videos....you'll learn a LOT about Offshore
Weather info/forecasts sources and applications...
Please let me preface the answers to your questions, with this fact....
You will get the SAME weather info / data and forecasts for FREE directly to your boat at any place you've queried about in this, via HF radio
Since Sirius uses the US NWS/NOAA Marine offshore
weather info/forecasts, there is really nothing to be gained by using Sirius Marine weather, other than you can use your chartplotter
to read the forecast
on, or view the weather chart on...
These same forecasts and charts
are updated 4 times a day, and transmitted for free to you worldwide....
So, if your goal is offshore weather info/forecasts, when away from terrestrial sources (away from cellular, Wi-Fi, etc.), then please note that all of what Sirius broadcasts is available for free elsewhere / direct from the source!
Okay, onto the answers!
FYI, This has been discussed at length here, and the satellites and orbits are still all the same as before, and Sirius Marine Weather offerings are as well....(not sure if XM has made any changes, but with Sirius by far the better choice for coverage and marine weather data, few mariners bother with XM....although XM does a great job with CONUS aviation weather!)
Please read ALL of the referenced threads here, AND follow the links in those threads, and you'll have more info / details than you could imagine!!
And, again....please watch these videos....as they will answer a LOT of your questions!!
I will answer
questions with both Sirius and XM info...just be aware they are different!!
Originally Posted by sharkwatcher
Maybe I should restate my question. How far outside of CONUS can I expect to get XM weather reception
Sirius (weather and music, the same coverage) coverage / reception is quite good, far beyond CONUS....
[I have personal knowledge of all of this, not just rehashing something I read somewhere]
Eastern edge of reliable coverage from your boat is well east of Canadian maritimes and Bermuda, and into the eastern Caribbean as well....(some with fixed antennas on shore, even get signal/reception in the Azores!)
The eastern coverage starts to fade once south of Antigua / 17*N....but is still usable down to about Martinique / 14*N....(some do report reception as far southeast as Grenada, but not reliable there...)
The "southern" coverage is good throughout Mexico, but starts to fade as you get into C. Amer...and although there is some reception reported in Panama, like Grenada it's not reliable (and I've only heard of one guy who gets Sirius in Panama, on shore!)
The western coverage extends from a few hundred miles offshore of Mexico, through the eastern Pacific, and up to Alaska....
The western coverage fades about 1/2 to 2/3 the way to Hawaii....
(Alaska is the ONLY place that I have no personal knowledge of reception, so all I can do is tell you to assume no coverage there....)
XM reception I have no personal experience with, just anecdotal reports and their coverage maps...
But, XM reception / coverage is much more limited....typically covering out past CONUS approx. 250 miles....
How far outside of CONUS does XM weather information extend?
Can you get weather information for eastern Bahams? T&C? USVI? Porto Rico?
XM, I'm not sure about...but I assume their weather info is as limited as their coverage....but that's moot...'cause if you can't get the signal, you can't get their weather info!
And, the answer is:
USVI and PR, etc. = NO XM coverage!
Bahamas = some coverage
Eastern Bahamas and T&C = some coverage / not reliable
As for Sirius Marine weather information...
They DO provide the NWS/NOAA Offshore forecast for the SW N. Atl (including the Bahamas and T&C), which does cover down to PR and USVI / BVI....
(but last time I checked, 3 years ago, they did not provide marine weather farther down / no Caribbean coverage)
I'm trying to determine if XM Weather is worth the price.
In my opinion, no it's not worth the price...
I have Predict Wind
that give a lot of great weather data, but is limited to areas where I have 3g/4g/WiFi service for receiption, but weather info for outside of CONUS.
For ~ $100 you'll have access (for FREE) to Offshore Voice weather info / forecasts from multiple stations (NMN, NMG, WLO, etc.) 8 - 12 times a day, for FREE...that will cover you all through the Bahamas, T&C, PR, USVI, BVI, Carib, Gulf of Mexico, etc. etc.
(and wider area weather info/forecasts covering you all the way across the Atlantic, as well)
And, adding some free software (JVComm, etc.) to your PC will get you weather charts on your PC (directly from the seasoned marine meteorologists), updated 4 times a day...also for FREE...
And, please note that all of this weather info/forecasts are from human beings (experienced / seasoned marine meteorologists, who sign their name to each forecast), NOT raw computer model data that is propagated so much on-line, in smart phone apps, and from GRIB's, etc...
Please read these threads here....and follow the links in them, for LOTS of details!!
sirius xm weather in the caribbean?
Sirius Weather Service ?
Sirrius XM Weather range
Sea of Cortez & Sirius/XM Weather
XM weather or what else
And, here too...
Offshore / Hi-Seas Weather data / forecasts
SSB receiver advice?
Obtaining Accurate Offshore/Hi-Seas Weather data/forecasts, while at sea
And, again....please watch these videos....