Can confirm. I run the Great Lakes Relay [1] each year. It's a 275 mile course along northern Michigan. We go through some heavily wooded areas for multiple day

Can confirm. I run the Great Lakes Relay [1] each year. It's a 275 mile course along northern Michigan. We go through some heavily wooded areas for multiple days at a time. We usually do not have cell service. Even GPS is spotty at times. Furthermore, the driving directions and running directions don't always use roads. Here's some examples: Driving directions: turn left at C509 (unmarked) for 2.9 miles. The exchange is past the creek. There will be big puddles, plow through them. Problems happen when you're in a Honda civic that can't go through 2.5 feet of water. So you have to turn around and find your own way to the exchange, with no cell service. We always bring multiple copies of a Michigan Atlas. This way we can pinpoint where we are (using GPS) and find nearby roads, despite the terrible race directions. [1]: https://en.wikipedia.org/wiki/Great_Lakes_Relay https://en.wikipedia.org/wiki/Great_Lakes_Relay