ARDF - Amateur Radio Direction Finding

ARDF "Amateur Radio Direction Finding"  is a kind of orienteering with a radio direction finding signal.  Five small transmitters (called foxes) hidden in the predominantly wooded area have to be found with the help of an appropriate radio direction finding receiver. 
Instead of predefined orienteering items being entered on the map, the "foxes" transmit a radio signal on the 2m band (144 MHz) or 80m band (3.5 MHz) .

 As with orienteering, the goal is to run out the posts, to stamp them and to arrive at the finish line before a predefined limit time has expired (usually 2 hours).  

The marching order of the posts should be chosen as far as possible according to the most optimal route. 

The approximate locations of the individual posts are to be estimated at the beginning of the run on the basis of the targeted radio signal and determined for themselves with an approximate position on the map. After that, you have to run and stamp all the foxes on a tactically clever route.
The difficulty, especially with the 2m signal, are incorrect bearings which are caused by reflective signals. This can be the case, for example, with wet foliage.
So it's a great mix of strategy, orientation, sport and technique.

SOTA - Summits on the Air

The combination of competition, hiking technique and breathtaking views of the peaks is the motivating drive. From the smallest referenced hills to high alpine mountains, there is everything that counts points. Depending on the altitude gradation, different scores of the competition are to be collected (1 to 10 points).  

There are 1,345 authorised SOTA summits in Switzerland alone (as of 01.01.2023). It has worldwide SOTA summits, which can be activated. 

Depending on the difference in altitude, there are different point values to collect. 
Depending on the points collected, there are different certificates and awards. 
The goal is to be able to make as many connections as possible. At least 4 radio connections are required per summit.

OL - Orienteering

Orienteering is a running sport and takes place mainly in wooded areas. Here and there, however, these are also carried out in the cities.
In the terrain, several control points are defined by means of an orange/white prism, which must be found with the help of a map and compass. The runner chooses his optimal route himself. Orienteering requires physical fitness, a good sense of direction and a high level of mental performance.