The problem with the on-board-GPS electronic compasses is that:

1. At least from what I've read, they put a substantial load on the battery consumption. This is my biggest concern. I've not read good things about them. <img src="/images/graemlins/frown.gif" alt="" />

2. I often prefer to shut off the GPS while following a longer bearing in order to save batteries. With the GPS turned off - no compass. <img src="/images/graemlins/blush.gif" alt="" />

3. Last I knew, electronic compasses were not nearly as accurate as a good magnetic compass - maybe +/- 2 degrees at best. <img src="/images/graemlins/confused.gif" alt="" />

4. It is VERY awkward (impossible?) to use map/compass orienteering techniques with a GPS compass. <img src="/images/graemlins/grin.gif" alt="" />