As the F5 version we have was not built for instrument navigation there's not a whole lot you can do. TACAN's are getting introduced later in the campaign, as the forces are getting more supplies and the UN bases are consolidated throughout the conflict.
Most of the waypoints are built around easily spotted landmarks, lakes, clearings in the forest, areas that are easy to recognize on the map on your kneeboard. F10 navigation is not bad, but if you study your flight plan and use the headings in the brief it's totally doable. If anything this should bring out more of your capabilities to navigate and increase your skills, it's more fun than chasing a caret on your HUD. Also, there's no shame in dropping a carrot on your kneeboard to get a fix on where you are.
Maintaining constant heading, speed and altitude are the first thing you have to do right as a pilot.