Hearts & Minds rules section 9.1 wrote:
The Air Cav, Gunboat, and Blue Water Navy (assets) may move to any legal province when mobilized. Each travels alone in a one unit group. Red units do not affect its movement. It is immune to ambush.
Mobilization happens when you spend 1 RP to mobilize all units in a province. Therefore they may move any distance, within the rules for their use, when you mobilize the province they are in.
Hearts & Minds rules section 8.3 bullet 3 wrote:
Spend 1 RP to mobilize all friendly units in one province.