![Cave Diving: Directional and Non-directional Markers 101 - International Training - SDI | TDI | ERDI | PFI Cave Diving: Directional and Non-directional Markers 101 - International Training - SDI | TDI | ERDI | PFI](https://www.tdisdi.com/wp-content/uploads/2016/02/REM.jpg)
Cave Diving: Directional and Non-directional Markers 101 - International Training - SDI | TDI | ERDI | PFI
Phil Short Technical - Cave Diving Navigation by Daniel Hutnan and Bill Philips is quite simply a long overdue and beautiful book! Now there will of course be opinions and likely controversy,
![Cave Diving: Directional and Non-directional Markers 101 - International Training - SDI | TDI | ERDI | PFI Cave Diving: Directional and Non-directional Markers 101 - International Training - SDI | TDI | ERDI | PFI](https://www.tdisdi.com/wp-content/uploads/2016/02/Cookie_Clothespin.jpg)
Cave Diving: Directional and Non-directional Markers 101 - International Training - SDI | TDI | ERDI | PFI
![Cave Diving: Directional and Non-directional Markers 101 - International Training - SDI | TDI | ERDI | PFI Cave Diving: Directional and Non-directional Markers 101 - International Training - SDI | TDI | ERDI | PFI](https://www.tdisdi.com/wp-content/uploads/2016/02/Cave_Diving_Directional1.jpg)