by beaky » Sat Mar 12, 2011 2:29 pm
At the very least, you can use very simple dead reckoning (the art of determining position using time, pre-verified distances, speed and heading). If you can see the ground, you can also apply pilotage (the art of determining position based on what you can see).
When you make your flight plan, try to insert as many waypoints as you can, close to or on your intended course. Note the distances involved, and based on your airspeed as you go, try to calculate at any given time how far you've come and how soon you'll expect to arrive at the next waypoint.
If that leaves you with a squiggly course line, re-do the plan for a straight shot, but keep that list of waypoint distances handy. It won't be 100% accurate on your straight-line course, but it will help.
Of course, there will probably be wind aloft, so your airspeed won't count for much. But if it takes you xx minutes to get from point A to B, and you know the distance between A and B- voila! You can figure out your average ground speed with very simple math. You can then apply that ground speed at any time to get a reasonably accurate estimate of how far out you are (distance remaining based on time remaining at that ground speed).
If you're in clouds or above clouds, use the times that you pass certain VORs as your waypoints. Even if a VOR station is a long way off from your course, if you know that you'll be passing, say, west of it , if you set the OBS for 270, when the receiver flips from TO to FROM (or vice versa) you will know when you've passed it, more or less.
None of this works as well as using a chart and actually navigating, but it's better than nothing, assuming you are not using GPS.
Last edited by
beaky on Sat Mar 12, 2011 2:34 pm, edited 1 time in total.