You can set an alarm on a Mark, and get a notification on your phone (or on a connected wearable device) when you approach that point (Proximity Alarm), or when you stray to far from it (Anchor Alarm).
Use of this feature requires the Memory-Map Professional license. Sign in to activate your Professional license, or use a free 10 day demo period for evaluation.
When you enable the alarm, you can set the Anchor and the Proximity alarm distance. To set a Proximity alarm, leave the Anchor alarm distance at zero.
When you set an anchor alarm, typically you don't want the alarm to go off when you are a long distance from that point. So if you enter an Anchor alarm distance and leave the Proximity alarm distance at zero, the app automatically suppresses the alarm when you are double the distance plus 1km from the point. You can change this behavior by entering a different Proximity alarm distance.
The Anchor alarm radius must be smaller than the Proximity alarm radius. The alarm zone is an annulus between the two.
When the alarm goes off, the app displays a system notification, and plays a sound, once. The notification is automatically dismissed when the alarm condition ends (eg, you move out of the area).
The notification is continuously updated, giving the name of the mark causing the alarm, and your distance from it. If you have an Android Wear watch or similar device, it displays the updated notification text.
In the General Settings dialog, you can choose to disable all notification, and you can choose what notification sound is played. If you want a sound that is more attention-grabbing than the system-provided sounds on your device, use a third party app that allows you to choose any MP3 for a notification. There are web sites with free downloadable sound effects (I found a smoke alarm sound).