The only problem with your setup is that the US version of the Rino is a 462.XXXX/467.XXXX MHz frs/gmrs radio unless you have the 142/153 MHz Nordic, Norway/Sweden model, which isn't out yet so you most likely don't have that model and it doesn't cover the ham bands anyway.
All the legal S#!t aside, your taking a transmission originating from 462/467 MHz and rebroadcasting it on 144.39MHz amateur, now do you see any problem with this method especially since you appear to be a newly licensed ham?
Now there is another way to get the 462/467 MHz US Rino into the 440 to 449.9875 US ham band but it isn't documented or known outside or inside of Garmin Engineering nor is it a user modification simply because it requires extensive RF board changes to make the radio play there which removes its type acceptance for use at 462/467 MHz.
To do things leagaly for ham band use only it would actually only cover as low as 442 MHz and up to 449.9875 since 442Mhz is the low coverage end of the VCO.
To finalize the conversion you would need to reroute the Fujitsu MB15E03 PLL's clock, data and chip enable lines to a preprogrammed Pic processor or a processor of your choice to bit bang the frequency in the 440 ham band so that the receiver is then using high side Local oscillator injection in the ham bands and change 3 caps and 2 resistors in the synthesizer loop filter to lower tx spurs below 449 Mhz.
This mod also requires replacing the narrow 462 to 468 Mhz receiver SAW filter with a proper filter in the same footprint for the US ham band.
And changing 3 caps in the transmitter low pass filter to achieve acceptable 2nd and 3rd harmonic rejection, fortunately the transmitter power amp stages are wide enough that the radio will still put out 4 watts in the 442 to 449.9875 MHz band.
Then there are some minor setup issues with actually setting the radio to think its on a gmrs channel so that it truly does put out 4 to 5 watts but this is simply radio keypad programming.
As you can probably see I have already done this to a Rino 655 but since the modulation is not legal for ham use I don't use themodified radio anymore on these bands, it was just done as I mention to my radio to see how well it worked until another engineer mentioned that the MSK modulation is not a protocol used on the US ham bands, and if you ask anybody at garmin if they know about this they will tell you that they don't as it is not authorized as this was a privately owned radio done at home on my own time all with my own purchased digikey components.
Also the baseband GPS and FM audio processor is a specially made CML microelectronics chip with a MSK modulation which is not quite legal on the ham bands, now I'm not saying that the FCC would do anything about this but there is a fine line as to what type of modulation you can and cannot use on the ham bands and so far the Rino doesn't meet any of these.
When this radio was certified it was done for 3 countries in 3 different versions, US and Canada in your version, Australia in a slightly different UHF band model and the Nordic version which is the above mentioned 142/153 MHz ultra narrowband 3.5 KHz rx bandwidth model.
Again as mentioned above none of these models by the way use a modulation that is as yet type accepted by the FCC for the ham bands.
The nordic VHF model is even harder to get to work in the 144 to 147.995Mhz ham band but it can also be done.
Mike
Olathe, KS.