They differ in their responsiveness to changes in direction and their tolerance for being tilted off level. They are all similar in accurately indicating direction but their sizes affect the precision and ease with which they can be read.

1. The generic Compact compass seen in wrist straps, hose mounts and smaller consoles is a good choice for those divers who just need to know general direction, i.e. the dive briefing is 'swim west' and you need to know which direction to swim. You have to be patient and careful to hold it level to take an accurate reading.
2. The DGX Tech Compass offers a depth compensating bungee wrist mount preferred by most experienced divers. The compass card offers a smooth movement across a wide range of motion. It has a low profile design that is typical of diving compasses in terms of needing to be held level to take reading. Most divers find this modestly priced compass will meet their navigation needs.
3. The DGX Deluxe Pro Compass also incorporates a bungee wrist mount and features a highly responsive compass card with a tilt potential of +/- 30°, more than most diving compasses and equal to the best versions available. The trade off to get that tolerance for tilt is the body of the compass has to be larger.