Coordinate Approach Alarm

My Garmin handheld device will do this, but you have to set it up for each waypoint individually. I did it on one measurement and decided it was too much work for the benefit it provided.

I did a google search (you probably did too) and mostly what comes up is people asking for this feature in different apps user comments sections.

If you save your waypoints in a google maps map, you can bring that map up when you go to the location to measure. Then tap on your 1-mile mark waypoint and then tap to get directions to it. You will have to ignore the directions since the route they choose might be different from the race route, but you will be able to tell when you are getting close to your destination from the audio instructions. Then tap on the 2-mile waypoint and repeat.

Alternatively, if you know approximately where your next mile mark is, you can tap and hold that location to create a waypoint, and then tap to get directions to it, so again, it will tell you when you are getting close.

Interesting, Mark. I may try this. The one thing that has most helped me not blow by a timing point is having my Veeder-Root display on my handlebars, using the Jones-Lucas model counter. Yet, I can still miss one occasionally, especially in an urban measuring setting in which self-preservation must always be paramount.