Originally Posted by
rudestuff
Are you talking about the ILS track on a chart? The gradient is usually about 300' per mile, so if there's someone on the slope, that's where to expect them. If you're VFR in uncontrolled airspace, just look out the window like normal - you can fly down it, across it or even up it - but common sense says avoid it especially if it's the active.
At 10 miles, it's around 3000' so you could fly under it at 1500', likewise at 3 miles it'll be around 900' so you could fly over it at 2000'
If more or less overflying the airfield, then the inbound leg - the one marked on the chart! - is indeed low enough not to have to worry about; it's the beacon outbound leg starting from 2,000' or 3,000' that's more likely to be interesting. Oh, and if Cambridge ATC is on one of its half hour breaks due staff shortages there will be people milling around at all levels in the overhead waiting for them to open again, but IME the "Cambridge traffic" calls work fine.
Suggest overflying Cambridge at 2,500' - that's what most passing traffic seems to do, cloud permitting. I've never heard this be a problem (well, instrument training traffic might be given "not above 2,000' on the go-around" to keep out of your way, but that's all good practice for the student).