Searching for a real-time GPS tracker app with the ability to follow a lot of users

Hello everyone!
I hope someone can help me with this problem:
Soon I'm going to organize a big hitchhiking event. Around 20 teams will be racing against each other to race across The Netherlands.
Every team is going to document the trip with camera's. Since I will also do the editing of the video's afterwards, I would like to show a map with the positions of the teams at several times during that day.

To achieve this, I'm searching for an app that:
- Gives real-time GPS position (uploads the GPS position every <5 minutes)
- Gives me the possibility to see each gps location on one map on PC/Mac, for example in browser (preferable with history, so I can look back later. For example: select 2:00PM and see where each team was at that time)
- Doesn't let the teams see the locations of the other teams

Does someone know if there is an app like that? Preferable an app solution that's available for both Android and iOS.
I really hope someone can help me with this question

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