You want to inform of your position, the persons you are joining?
Create a one-time link, and send it to one or several contacts by SMS.
Once they receive the message, they just have to click on the link and will be able to see your position on the map.
Upon arrival, stop the tracking. Your position will not be monitored anymore, and your link is deleted. No information regarding your position will be kept.
Continued use of GPS running in the background can dramatically decrease battery life.