Switching Nav1 / Nav2 should not change preselected course. Unfortunately is working different.
Sample in the vicinity of EYKA vor KNA:
Set: Nav1 direct KNA then set course 200
Set: Nav2 direct KNA then set course 300
Switch Nav1/Nav2 and you will have course from present position of aircraft to KNA.
Most GPS’s has OBS mode. Pilot has possibility to fly by some preselected course to/from the point. If pilot has preselected some course on Nav1 or Nav2 - switching between Nav’s should not change preselected in advance courses (radials). It should be done by pilot new course preselecting or “direct to” selecting.
I found this situation inconvenient in ILS app training in EYKA with my students. On Nav1 we set ILS 08 app, on Nav2 downwind radial 287. Unfortunately after touch and go when we returning to Nav2 to fly radial 287 from KNA we found course from present position to KNA.
In general switching Nav1 / Nav2 should not change preselected course. More flexible in course setting to have “Direct to” button instead “Hide” button.
Best wishes
Viktoras Ramonas
Baltic Aviation Academy pilot instructor.