Licensing and common Frequencies - UHF/HF

Hi Folks (we are new members so please excuse our ignorance),

I am currently overseas in a 4th world country where my access to the internet is time limited. I am trying to purchase equipment and organise work on my vehicle in preparation for the summer so rather than wasting my family communication time I thought I would try and access the impressive amount of corporate knowledge held by the members and visitors of this site.

I have just purchased a UHF GPS105. Can anyone tell me off the top of their heads what are the requirements as far as licensing and remaining legal goes ?

What are the common and emergency UHF frequencies ?

Also does anyone know if this unit can be changed from lat/long to Grid GPS operations/inputs ( I am ex Army - we used Grid not lat/long) ?

What are the licensing requirements if I wanted to hire a HF set for a couple of weeks for Simpson crossing or similar ?

Thanks for your time.

Cheers.....Taz