There are numerous apps for GPS location and tracking available for smartphones and related devices, and MUAB does not review these, or recommend any particular apps as suitable for the requirements of individual walkers. However a number of MUAB walkers use such apps on their devices, and it is worth discussing with them what they have found to be the benefits and limitations. Note that some are free, and others require commercial purchase.
As described above, the Avenza PDF Maps app is useful for following park trails. Other apps in common usage are Map my Walk, myTracks, and Navionics Hike and Bike. A top of the range app, particularly useful when doing major self-guided walks, is Gaia Maps. Some enable you to download the maps before the walk, so that utility is not dependent on a phone signal while walking. You do however need battery power, and they can be heavy on battery use, so carrying a back-up battery pack is wise.
The best way to deal with the plethora of options, after discussion and a bit of research on what is available for your device, is to try them out and see what, if any, appeal to you. For those who enjoy playing with technology, it can be a lot of fun, as well as providing another layer of safety when out in the bush. They do not, however, replace good map reading skills and bushcraft, and should only ever be used as a secondary source of data, not least because of the likelihood of patchy connectivity when in the bush.
There are also dedicated GPS devices which some members may wish to consider for purchase. These provide a range of benefits well beyond what may be available through a smartphone. Anyone considering such a purchase would be well advised to undertake careful research through reputable sources.
As the MUAB Walk Leaders scope all walks prior to the event, general members should not feel the need to have GPS tracking apps or devices themselves, but only go down that pathway if they find the concept interesting and appealing.